{
 "schema_version": 1,
 "methodology_version": "1.0",
 "release": "2026-08",
 "generated_at": "2026-09-02T21:36:36.935425Z",
 "unit": "USD per carat (pinned-rate internal unit of account; see methodology)",
 "sampling": "systematic 1-in-10 sample of listings; latest observation per listing per calendar month",
 "filters": {
  "carat_min": 0.25,
  "carat_max": 10.0,
  "ppc_min": 100,
  "ppc_max": 100000
 },
 "monthly_series": [
  {
   "month": "2025-12",
   "segments": {
    "lab_grown": {
     "listings_observed": 509675,
     "median_usd_per_carat": 783.62,
     "q1_usd_per_carat": 534.72,
     "q3_usd_per_carat": 1210.0
    },
    "natural": {
     "listings_observed": 359674,
     "median_usd_per_carat": 2193.75,
     "q1_usd_per_carat": 1599.92,
     "q3_usd_per_carat": 3409.9
    },
    "overall": {
     "listings_observed": 872842,
     "median_usd_per_carat": 1279.07,
     "q1_usd_per_carat": 689.0,
     "q3_usd_per_carat": 2187.22
    }
   }
  },
  {
   "month": "2026-01",
   "segments": {
    "lab_grown": {
     "listings_observed": 529294,
     "median_usd_per_carat": 715.58,
     "q1_usd_per_carat": 497.09,
     "q3_usd_per_carat": 1112.98
    },
    "natural": {
     "listings_observed": 253828,
     "median_usd_per_carat": 2238.61,
     "q1_usd_per_carat": 1656.4,
     "q3_usd_per_carat": 3472.04
    },
    "overall": {
     "listings_observed": 783415,
     "median_usd_per_carat": 1064.38,
     "q1_usd_per_carat": 612.36,
     "q3_usd_per_carat": 1961.45
    }
   }
  },
  {
   "month": "2026-02",
   "segments": {
    "lab_grown": {
     "listings_observed": 1079386,
     "median_usd_per_carat": 665.5,
     "q1_usd_per_carat": 442.48,
     "q3_usd_per_carat": 978.81
    },
    "natural": {
     "listings_observed": 667794,
     "median_usd_per_carat": 2328.75,
     "q1_usd_per_carat": 1646.54,
     "q3_usd_per_carat": 3805.0
    },
    "overall": {
     "listings_observed": 1747421,
     "median_usd_per_carat": 1063.7,
     "q1_usd_per_carat": 581.59,
     "q3_usd_per_carat": 2116.5
    }
   }
  },
  {
   "month": "2026-03",
   "segments": {
    "lab_grown": {
     "listings_observed": 1427441,
     "median_usd_per_carat": 560.32,
     "q1_usd_per_carat": 364.09,
     "q3_usd_per_carat": 837.64
    },
    "natural": {
     "listings_observed": 772446,
     "median_usd_per_carat": 2221.53,
     "q1_usd_per_carat": 1573.73,
     "q3_usd_per_carat": 3562.5
    },
    "overall": {
     "listings_observed": 2199963,
     "median_usd_per_carat": 855.77,
     "q1_usd_per_carat": 461.36,
     "q3_usd_per_carat": 1885.52
    }
   }
  },
  {
   "month": "2026-04",
   "segments": {
    "lab_grown": {
     "listings_observed": 1356585,
     "median_usd_per_carat": 534.55,
     "q1_usd_per_carat": 369.33,
     "q3_usd_per_carat": 839.33
    },
    "natural": {
     "listings_observed": 793099,
     "median_usd_per_carat": 2213.78,
     "q1_usd_per_carat": 1564.88,
     "q3_usd_per_carat": 3603.67
    },
    "overall": {
     "listings_observed": 2149703,
     "median_usd_per_carat": 900.0,
     "q1_usd_per_carat": 455.06,
     "q3_usd_per_carat": 1980.0
    }
   }
  },
  {
   "month": "2026-05",
   "segments": {
    "lab_grown": {
     "listings_observed": 1306460,
     "median_usd_per_carat": 543.38,
     "q1_usd_per_carat": 399.06,
     "q3_usd_per_carat": 831.25
    },
    "natural": {
     "listings_observed": 746751,
     "median_usd_per_carat": 2230.76,
     "q1_usd_per_carat": 1562.46,
     "q3_usd_per_carat": 3630.94
    },
    "overall": {
     "listings_observed": 2053218,
     "median_usd_per_carat": 876.81,
     "q1_usd_per_carat": 469.74,
     "q3_usd_per_carat": 1941.11
    }
   }
  },
  {
   "month": "2026-06",
   "segments": {
    "lab_grown": {
     "listings_observed": 1504718,
     "median_usd_per_carat": 500.91,
     "q1_usd_per_carat": 341.44,
     "q3_usd_per_carat": 763.51
    },
    "natural": {
     "listings_observed": 762617,
     "median_usd_per_carat": 2249.71,
     "q1_usd_per_carat": 1549.14,
     "q3_usd_per_carat": 3657.68
    },
    "overall": {
     "listings_observed": 2267342,
     "median_usd_per_carat": 756.81,
     "q1_usd_per_carat": 414.01,
     "q3_usd_per_carat": 1851.87
    }
   }
  },
  {
   "month": "2026-07",
   "segments": {
    "lab_grown": {
     "listings_observed": 1269374,
     "median_usd_per_carat": 528.66,
     "q1_usd_per_carat": 345.37,
     "q3_usd_per_carat": 853.39
    },
    "natural": {
     "listings_observed": 727549,
     "median_usd_per_carat": 2296.54,
     "q1_usd_per_carat": 1598.4,
     "q3_usd_per_carat": 3736.0
    },
    "overall": {
     "listings_observed": 1996929,
     "median_usd_per_carat": 899.56,
     "q1_usd_per_carat": 443.36,
     "q3_usd_per_carat": 2035.1
    }
   }
  },
  {
   "month": "2026-08",
   "segments": {
    "lab_grown": {
     "listings_observed": 1424754,
     "median_usd_per_carat": 464.15,
     "q1_usd_per_carat": 311.43,
     "q3_usd_per_carat": 790.6
    },
    "natural": {
     "listings_observed": 735076,
     "median_usd_per_carat": 2184.28,
     "q1_usd_per_carat": 1543.03,
     "q3_usd_per_carat": 3588.24
    },
    "overall": {
     "listings_observed": 2159855,
     "median_usd_per_carat": 793.65,
     "q1_usd_per_carat": 371.25,
     "q3_usd_per_carat": 1794.39
    }
   }
  }
 ],
 "deltas": {
  "natural": {
   "mom_pct": -4.89
  },
  "lab_grown": {
   "mom_pct": -12.2
  },
  "overall": {
   "mom_pct": -11.77
  }
 },
 "cross_retailer_spread": {
  "lab_grown": {
   "multi_retailer_diamonds": 1926881,
   "avg_spread_pct": 138.9,
   "median_spread_pct": 118.5,
   "total_spread_usd": 2286908565
  },
  "natural": {
   "multi_retailer_diamonds": 1714938,
   "avg_spread_pct": 55.5,
   "median_spread_pct": 39.7,
   "total_spread_usd": 3081649647
  }
 },
 "counts": {
  "active_retailers": 127,
  "active_listings": 33819218,
  "certified_diamonds": 13999549,
  "cross_retailer_diamonds": 4645741,
  "counts_as_of": "2026-08"
 },
 "min_cell_obs": 150,
 "by_shape": {
  "ROUND": {
   "natural": [
    {
     "month": "2025-12",
     "median_usd_per_carat": 2082.96,
     "listings_observed": 201787
    },
    {
     "month": "2026-01",
     "median_usd_per_carat": 2121.57,
     "listings_observed": 137675
    },
    {
     "month": "2026-02",
     "median_usd_per_carat": 2234.79,
     "listings_observed": 333060
    },
    {
     "month": "2026-03",
     "median_usd_per_carat": 2134.62,
     "listings_observed": 411630
    },
    {
     "month": "2026-04",
     "median_usd_per_carat": 2130.0,
     "listings_observed": 396352
    },
    {
     "month": "2026-05",
     "median_usd_per_carat": 2161.43,
     "listings_observed": 377783
    },
    {
     "month": "2026-06",
     "median_usd_per_carat": 2125.35,
     "listings_observed": 375622
    },
    {
     "month": "2026-07",
     "median_usd_per_carat": 2177.84,
     "listings_observed": 364473
    },
    {
     "month": "2026-08",
     "median_usd_per_carat": 2094.31,
     "listings_observed": 361006
    }
   ],
   "lab_grown": [
    {
     "month": "2025-12",
     "median_usd_per_carat": 776.14,
     "listings_observed": 144115
    },
    {
     "month": "2026-01",
     "median_usd_per_carat": 730.0,
     "listings_observed": 147633
    },
    {
     "month": "2026-02",
     "median_usd_per_carat": 669.88,
     "listings_observed": 346886
    },
    {
     "month": "2026-03",
     "median_usd_per_carat": 565.88,
     "listings_observed": 483239
    },
    {
     "month": "2026-04",
     "median_usd_per_carat": 539.5,
     "listings_observed": 500319
    },
    {
     "month": "2026-05",
     "median_usd_per_carat": 544.14,
     "listings_observed": 496032
    },
    {
     "month": "2026-06",
     "median_usd_per_carat": 484.11,
     "listings_observed": 548592
    },
    {
     "month": "2026-07",
     "median_usd_per_carat": 509.45,
     "listings_observed": 485982
    },
    {
     "month": "2026-08",
     "median_usd_per_carat": 437.5,
     "listings_observed": 525290
    }
   ]
  },
  "OVAL": {
   "natural": [
    {
     "month": "2025-12",
     "median_usd_per_carat": 2463.18,
     "listings_observed": 34416
    },
    {
     "month": "2026-01",
     "median_usd_per_carat": 2676.57,
     "listings_observed": 27770
    },
    {
     "month": "2026-02",
     "median_usd_per_carat": 2574.67,
     "listings_observed": 77976
    },
    {
     "month": "2026-03",
     "median_usd_per_carat": 2602.84,
     "listings_observed": 75941
    },
    {
     "month": "2026-04",
     "median_usd_per_carat": 2584.92,
     "listings_observed": 96199
    },
    {
     "month": "2026-05",
     "median_usd_per_carat": 2566.21,
     "listings_observed": 93189
    },
    {
     "month": "2026-06",
     "median_usd_per_carat": 2630.56,
     "listings_observed": 93489
    },
    {
     "month": "2026-07",
     "median_usd_per_carat": 2633.33,
     "listings_observed": 88104
    },
    {
     "month": "2026-08",
     "median_usd_per_carat": 2379.78,
     "listings_observed": 80341
    }
   ],
   "lab_grown": [
    {
     "month": "2025-12",
     "median_usd_per_carat": 830.74,
     "listings_observed": 67104
    },
    {
     "month": "2026-01",
     "median_usd_per_carat": 728.98,
     "listings_observed": 84039
    },
    {
     "month": "2026-02",
     "median_usd_per_carat": 667.97,
     "listings_observed": 187218
    },
    {
     "month": "2026-03",
     "median_usd_per_carat": 566.38,
     "listings_observed": 262051
    },
    {
     "month": "2026-04",
     "median_usd_per_carat": 530.19,
     "listings_observed": 245772
    },
    {
     "month": "2026-05",
     "median_usd_per_carat": 544.28,
     "listings_observed": 223820
    },
    {
     "month": "2026-06",
     "median_usd_per_carat": 516.0,
     "listings_observed": 256642
    },
    {
     "month": "2026-07",
     "median_usd_per_carat": 548.57,
     "listings_observed": 208210
    },
    {
     "month": "2026-08",
     "median_usd_per_carat": 487.01,
     "listings_observed": 238987
    }
   ]
  },
  "CUSHION": {
   "natural": [
    {
     "month": "2025-12",
     "median_usd_per_carat": 2657.22,
     "listings_observed": 9954
    },
    {
     "month": "2026-01",
     "median_usd_per_carat": 2572.03,
     "listings_observed": 7671
    },
    {
     "month": "2026-02",
     "median_usd_per_carat": 2711.45,
     "listings_observed": 27587
    },
    {
     "month": "2026-03",
     "median_usd_per_carat": 2584.16,
     "listings_observed": 30897
    },
    {
     "month": "2026-04",
     "median_usd_per_carat": 2617.65,
     "listings_observed": 32301
    },
    {
     "month": "2026-05",
     "median_usd_per_carat": 2640.59,
     "listings_observed": 31783
    },
    {
     "month": "2026-06",
     "median_usd_per_carat": 2764.85,
     "listings_observed": 35467
    },
    {
     "month": "2026-07",
     "median_usd_per_carat": 2760.92,
     "listings_observed": 38919
    },
    {
     "month": "2026-08",
     "median_usd_per_carat": 2791.67,
     "listings_observed": 37370
    }
   ],
   "lab_grown": [
    {
     "month": "2025-12",
     "median_usd_per_carat": 831.2,
     "listings_observed": 31907
    },
    {
     "month": "2026-01",
     "median_usd_per_carat": 757.11,
     "listings_observed": 32610
    },
    {
     "month": "2026-02",
     "median_usd_per_carat": 688.99,
     "listings_observed": 62251
    },
    {
     "month": "2026-03",
     "median_usd_per_carat": 564.76,
     "listings_observed": 76650
    },
    {
     "month": "2026-04",
     "median_usd_per_carat": 531.93,
     "listings_observed": 71109
    },
    {
     "month": "2026-05",
     "median_usd_per_carat": 546.0,
     "listings_observed": 80391
    },
    {
     "month": "2026-06",
     "median_usd_per_carat": 533.64,
     "listings_observed": 96105
    },
    {
     "month": "2026-07",
     "median_usd_per_carat": 546.46,
     "listings_observed": 84300
    },
    {
     "month": "2026-08",
     "median_usd_per_carat": 465.92,
     "listings_observed": 96757
    }
   ]
  },
  "PRINCESS": {
   "natural": [
    {
     "month": "2025-12",
     "median_usd_per_carat": 2243.01,
     "listings_observed": 13654
    },
    {
     "month": "2026-01",
     "median_usd_per_carat": 2247.52,
     "listings_observed": 8533
    },
    {
     "month": "2026-02",
     "median_usd_per_carat": 2238.03,
     "listings_observed": 26088
    },
    {
     "month": "2026-03",
     "median_usd_per_carat": 2163.0,
     "listings_observed": 28957
    },
    {
     "month": "2026-04",
     "median_usd_per_carat": 2098.13,
     "listings_observed": 26570
    },
    {
     "month": "2026-05",
     "median_usd_per_carat": 2077.81,
     "listings_observed": 24603
    },
    {
     "month": "2026-06",
     "median_usd_per_carat": 2206.5,
     "listings_observed": 28132
    },
    {
     "month": "2026-07",
     "median_usd_per_carat": 2142.0,
     "listings_observed": 26195
    },
    {
     "month": "2026-08",
     "median_usd_per_carat": 2073.1,
     "listings_observed": 26752
    }
   ],
   "lab_grown": [
    {
     "month": "2025-12",
     "median_usd_per_carat": 769.74,
     "listings_observed": 37026
    },
    {
     "month": "2026-01",
     "median_usd_per_carat": 699.59,
     "listings_observed": 35378
    },
    {
     "month": "2026-02",
     "median_usd_per_carat": 659.21,
     "listings_observed": 71528
    },
    {
     "month": "2026-03",
     "median_usd_per_carat": 575.19,
     "listings_observed": 80287
    },
    {
     "month": "2026-04",
     "median_usd_per_carat": 520.87,
     "listings_observed": 66005
    },
    {
     "month": "2026-05",
     "median_usd_per_carat": 563.72,
     "listings_observed": 58091
    },
    {
     "month": "2026-06",
     "median_usd_per_carat": 492.31,
     "listings_observed": 66879
    },
    {
     "month": "2026-07",
     "median_usd_per_carat": 519.39,
     "listings_observed": 55956
    },
    {
     "month": "2026-08",
     "median_usd_per_carat": 481.28,
     "listings_observed": 64162
    }
   ]
  },
  "EMERALD": {
   "natural": [
    {
     "month": "2025-12",
     "median_usd_per_carat": 2066.12,
     "listings_observed": 32099
    },
    {
     "month": "2026-01",
     "median_usd_per_carat": 2135.65,
     "listings_observed": 23098
    },
    {
     "month": "2026-02",
     "median_usd_per_carat": 2173.39,
     "listings_observed": 60554
    },
    {
     "month": "2026-03",
     "median_usd_per_carat": 2116.17,
     "listings_observed": 66566
    },
    {
     "month": "2026-04",
     "median_usd_per_carat": 2076.9,
     "listings_observed": 72989
    },
    {
     "month": "2026-05",
     "median_usd_per_carat": 2199.03,
     "listings_observed": 62427
    },
    {
     "month": "2026-06",
     "median_usd_per_carat": 2277.7,
     "listings_observed": 65294
    },
    {
     "month": "2026-07",
     "median_usd_per_carat": 2319.75,
     "listings_observed": 53175
    },
    {
     "month": "2026-08",
     "median_usd_per_carat": 2166.2,
     "listings_observed": 60125
    }
   ],
   "lab_grown": [
    {
     "month": "2025-12",
     "median_usd_per_carat": 678.7,
     "listings_observed": 61852
    },
    {
     "month": "2026-01",
     "median_usd_per_carat": 629.02,
     "listings_observed": 58324
    },
    {
     "month": "2026-02",
     "median_usd_per_carat": 609.03,
     "listings_observed": 111789
    },
    {
     "month": "2026-03",
     "median_usd_per_carat": 535.71,
     "listings_observed": 123437
    },
    {
     "month": "2026-04",
     "median_usd_per_carat": 531.71,
     "listings_observed": 106250
    },
    {
     "month": "2026-05",
     "median_usd_per_carat": 542.63,
     "listings_observed": 88932
    },
    {
     "month": "2026-06",
     "median_usd_per_carat": 488.12,
     "listings_observed": 105298
    },
    {
     "month": "2026-07",
     "median_usd_per_carat": 529.29,
     "listings_observed": 87004
    },
    {
     "month": "2026-08",
     "median_usd_per_carat": 493.87,
     "listings_observed": 94101
    }
   ]
  },
  "PEAR": {
   "natural": [
    {
     "month": "2025-12",
     "median_usd_per_carat": 2308.33,
     "listings_observed": 34375
    },
    {
     "month": "2026-01",
     "median_usd_per_carat": 2317.75,
     "listings_observed": 25881
    },
    {
     "month": "2026-02",
     "median_usd_per_carat": 2328.8,
     "listings_observed": 68350
    },
    {
     "month": "2026-03",
     "median_usd_per_carat": 2205.04,
     "listings_observed": 72377
    },
    {
     "month": "2026-04",
     "median_usd_per_carat": 2186.63,
     "listings_observed": 79411
    },
    {
     "month": "2026-05",
     "median_usd_per_carat": 2163.82,
     "listings_observed": 73097
    },
    {
     "month": "2026-06",
     "median_usd_per_carat": 2200.0,
     "listings_observed": 75795
    },
    {
     "month": "2026-07",
     "median_usd_per_carat": 2310.91,
     "listings_observed": 67103
    },
    {
     "month": "2026-08",
     "median_usd_per_carat": 2102.68,
     "listings_observed": 76739
    }
   ],
   "lab_grown": [
    {
     "month": "2025-12",
     "median_usd_per_carat": 857.14,
     "listings_observed": 55024
    },
    {
     "month": "2026-01",
     "median_usd_per_carat": 770.84,
     "listings_observed": 53112
    },
    {
     "month": "2026-02",
     "median_usd_per_carat": 717.24,
     "listings_observed": 92682
    },
    {
     "month": "2026-03",
     "median_usd_per_carat": 577.27,
     "listings_observed": 124675
    },
    {
     "month": "2026-04",
     "median_usd_per_carat": 542.69,
     "listings_observed": 122756
    },
    {
     "month": "2026-05",
     "median_usd_per_carat": 521.19,
     "listings_observed": 123561
    },
    {
     "month": "2026-06",
     "median_usd_per_carat": 506.33,
     "listings_observed": 151545
    },
    {
     "month": "2026-07",
     "median_usd_per_carat": 526.9,
     "listings_observed": 128417
    },
    {
     "month": "2026-08",
     "median_usd_per_carat": 478.1,
     "listings_observed": 148943
    }
   ]
  },
  "MARQUISE": {
   "natural": [
    {
     "month": "2025-12",
     "median_usd_per_carat": 2368.06,
     "listings_observed": 5005
    },
    {
     "month": "2026-01",
     "median_usd_per_carat": 2408.13,
     "listings_observed": 4776
    },
    {
     "month": "2026-02",
     "median_usd_per_carat": 2358.99,
     "listings_observed": 14478
    },
    {
     "month": "2026-03",
     "median_usd_per_carat": 2314.0,
     "listings_observed": 19017
    },
    {
     "month": "2026-04",
     "median_usd_per_carat": 2253.45,
     "listings_observed": 21262
    },
    {
     "month": "2026-05",
     "median_usd_per_carat": 2188.3,
     "listings_observed": 22610
    },
    {
     "month": "2026-06",
     "median_usd_per_carat": 2216.15,
     "listings_observed": 24260
    },
    {
     "month": "2026-07",
     "median_usd_per_carat": 2317.83,
     "listings_observed": 23518
    },
    {
     "month": "2026-08",
     "median_usd_per_carat": 2113.89,
     "listings_observed": 28472
    }
   ],
   "lab_grown": [
    {
     "month": "2025-12",
     "median_usd_per_carat": 785.31,
     "listings_observed": 32404
    },
    {
     "month": "2026-01",
     "median_usd_per_carat": 717.96,
     "listings_observed": 35206
    },
    {
     "month": "2026-02",
     "median_usd_per_carat": 663.94,
     "listings_observed": 61205
    },
    {
     "month": "2026-03",
     "median_usd_per_carat": 569.88,
     "listings_observed": 88955
    },
    {
     "month": "2026-04",
     "median_usd_per_carat": 517.48,
     "listings_observed": 83272
    },
    {
     "month": "2026-05",
     "median_usd_per_carat": 552.29,
     "listings_observed": 95577
    },
    {
     "month": "2026-06",
     "median_usd_per_carat": 526.78,
     "listings_observed": 105762
    },
    {
     "month": "2026-07",
     "median_usd_per_carat": 586.31,
     "listings_observed": 73866
    },
    {
     "month": "2026-08",
     "median_usd_per_carat": 500.0,
     "listings_observed": 94443
    }
   ]
  },
  "RADIANT": {
   "natural": [
    {
     "month": "2025-12",
     "median_usd_per_carat": 2929.66,
     "listings_observed": 5768
    },
    {
     "month": "2026-01",
     "median_usd_per_carat": 3000.0,
     "listings_observed": 3508
    },
    {
     "month": "2026-02",
     "median_usd_per_carat": 3112.15,
     "listings_observed": 14853
    },
    {
     "month": "2026-03",
     "median_usd_per_carat": 2739.16,
     "listings_observed": 14943
    },
    {
     "month": "2026-04",
     "median_usd_per_carat": 2798.03,
     "listings_observed": 16913
    },
    {
     "month": "2026-05",
     "median_usd_per_carat": 2508.97,
     "listings_observed": 16497
    },
    {
     "month": "2026-06",
     "median_usd_per_carat": 2643.65,
     "listings_observed": 20100
    },
    {
     "month": "2026-07",
     "median_usd_per_carat": 2608.89,
     "listings_observed": 21848
    },
    {
     "month": "2026-08",
     "median_usd_per_carat": 2764.93,
     "listings_observed": 20667
    }
   ],
   "lab_grown": [
    {
     "month": "2025-12",
     "median_usd_per_carat": 743.41,
     "listings_observed": 48556
    },
    {
     "month": "2026-01",
     "median_usd_per_carat": 667.31,
     "listings_observed": 52152
    },
    {
     "month": "2026-02",
     "median_usd_per_carat": 637.03,
     "listings_observed": 90686
    },
    {
     "month": "2026-03",
     "median_usd_per_carat": 513.27,
     "listings_observed": 118737
    },
    {
     "month": "2026-04",
     "median_usd_per_carat": 514.14,
     "listings_observed": 105038
    },
    {
     "month": "2026-05",
     "median_usd_per_carat": 507.62,
     "listings_observed": 86971
    },
    {
     "month": "2026-06",
     "median_usd_per_carat": 503.62,
     "listings_observed": 109279
    },
    {
     "month": "2026-07",
     "median_usd_per_carat": 540.95,
     "listings_observed": 86884
    },
    {
     "month": "2026-08",
     "median_usd_per_carat": 473.11,
     "listings_observed": 100022
    }
   ]
  },
  "ASSCHER": {
   "natural": [
    {
     "month": "2025-12",
     "median_usd_per_carat": 2860.44,
     "listings_observed": 5793
    },
    {
     "month": "2026-01",
     "median_usd_per_carat": 2708.67,
     "listings_observed": 3356
    },
    {
     "month": "2026-02",
     "median_usd_per_carat": 2783.43,
     "listings_observed": 11109
    },
    {
     "month": "2026-03",
     "median_usd_per_carat": 2327.16,
     "listings_observed": 12460
    },
    {
     "month": "2026-04",
     "median_usd_per_carat": 2281.45,
     "listings_observed": 12971
    },
    {
     "month": "2026-05",
     "median_usd_per_carat": 2230.8,
     "listings_observed": 11819
    },
    {
     "month": "2026-06",
     "median_usd_per_carat": 2439.42,
     "listings_observed": 13862
    },
    {
     "month": "2026-07",
     "median_usd_per_carat": 2342.08,
     "listings_observed": 12870
    },
    {
     "month": "2026-08",
     "median_usd_per_carat": 2601.46,
     "listings_observed": 13168
    }
   ],
   "lab_grown": [
    {
     "month": "2025-12",
     "median_usd_per_carat": 886.44,
     "listings_observed": 13000
    },
    {
     "month": "2026-01",
     "median_usd_per_carat": 781.22,
     "listings_observed": 12761
    },
    {
     "month": "2026-02",
     "median_usd_per_carat": 679.77,
     "listings_observed": 21730
    },
    {
     "month": "2026-03",
     "median_usd_per_carat": 574.99,
     "listings_observed": 24994
    },
    {
     "month": "2026-04",
     "median_usd_per_carat": 585.17,
     "listings_observed": 20776
    },
    {
     "month": "2026-05",
     "median_usd_per_carat": 587.48,
     "listings_observed": 18341
    },
    {
     "month": "2026-06",
     "median_usd_per_carat": 570.38,
     "listings_observed": 24003
    },
    {
     "month": "2026-07",
     "median_usd_per_carat": 508.86,
     "listings_observed": 19571
    },
    {
     "month": "2026-08",
     "median_usd_per_carat": 525.88,
     "listings_observed": 21899
    }
   ]
  },
  "HEART": {
   "natural": [
    {
     "month": "2025-12",
     "median_usd_per_carat": 2313.41,
     "listings_observed": 16025
    },
    {
     "month": "2026-01",
     "median_usd_per_carat": 2262.63,
     "listings_observed": 10754
    },
    {
     "month": "2026-02",
     "median_usd_per_carat": 2307.95,
     "listings_observed": 32082
    },
    {
     "month": "2026-03",
     "median_usd_per_carat": 2130.73,
     "listings_observed": 35812
    },
    {
     "month": "2026-04",
     "median_usd_per_carat": 2140.57,
     "listings_observed": 36404
    },
    {
     "month": "2026-05",
     "median_usd_per_carat": 2145.0,
     "listings_observed": 31566
    },
    {
     "month": "2026-06",
     "median_usd_per_carat": 2195.11,
     "listings_observed": 29507
    },
    {
     "month": "2026-07",
     "median_usd_per_carat": 2223.37,
     "listings_observed": 29556
    },
    {
     "month": "2026-08",
     "median_usd_per_carat": 2261.27,
     "listings_observed": 29010
    }
   ],
   "lab_grown": [
    {
     "month": "2025-12",
     "median_usd_per_carat": 772.78,
     "listings_observed": 17309
    },
    {
     "month": "2026-01",
     "median_usd_per_carat": 704.09,
     "listings_observed": 17136
    },
    {
     "month": "2026-02",
     "median_usd_per_carat": 683.15,
     "listings_observed": 29452
    },
    {
     "month": "2026-03",
     "median_usd_per_carat": 557.19,
     "listings_observed": 37794
    },
    {
     "month": "2026-04",
     "median_usd_per_carat": 545.45,
     "listings_observed": 30397
    },
    {
     "month": "2026-05",
     "median_usd_per_carat": 556.13,
     "listings_observed": 28323
    },
    {
     "month": "2026-06",
     "median_usd_per_carat": 496.04,
     "listings_observed": 34129
    },
    {
     "month": "2026-07",
     "median_usd_per_carat": 485.27,
     "listings_observed": 31470
    },
    {
     "month": "2026-08",
     "median_usd_per_carat": 439.5,
     "listings_observed": 31899
    }
   ]
  }
 },
 "by_lab": {
  "GIA": {
   "natural": [
    {
     "month": "2025-12",
     "median_usd_per_carat": 2239.43,
     "listings_observed": 320647
    },
    {
     "month": "2026-01",
     "median_usd_per_carat": 2278.0,
     "listings_observed": 222997
    },
    {
     "month": "2026-02",
     "median_usd_per_carat": 2345.22,
     "listings_observed": 591348
    },
    {
     "month": "2026-03",
     "median_usd_per_carat": 2280.96,
     "listings_observed": 668598
    },
    {
     "month": "2026-04",
     "median_usd_per_carat": 2292.51,
     "listings_observed": 677184
    },
    {
     "month": "2026-05",
     "median_usd_per_carat": 2308.2,
     "listings_observed": 634348
    },
    {
     "month": "2026-06",
     "median_usd_per_carat": 2324.0,
     "listings_observed": 653420
    },
    {
     "month": "2026-07",
     "median_usd_per_carat": 2346.34,
     "listings_observed": 584621
    },
    {
     "month": "2026-08",
     "median_usd_per_carat": 2241.94,
     "listings_observed": 607271
    }
   ],
   "lab_grown": [
    {
     "month": "2025-12",
     "median_usd_per_carat": 1467.16,
     "listings_observed": 27159
    },
    {
     "month": "2026-01",
     "median_usd_per_carat": 1375.96,
     "listings_observed": 22029
    },
    {
     "month": "2026-02",
     "median_usd_per_carat": 1448.37,
     "listings_observed": 66212
    },
    {
     "month": "2026-03",
     "median_usd_per_carat": 1379.22,
     "listings_observed": 74409
    },
    {
     "month": "2026-04",
     "median_usd_per_carat": 1430.56,
     "listings_observed": 65663
    },
    {
     "month": "2026-05",
     "median_usd_per_carat": 1613.73,
     "listings_observed": 41667
    },
    {
     "month": "2026-06",
     "median_usd_per_carat": 1334.31,
     "listings_observed": 58172
    },
    {
     "month": "2026-07",
     "median_usd_per_carat": 1200.67,
     "listings_observed": 51452
    },
    {
     "month": "2026-08",
     "median_usd_per_carat": 1141.54,
     "listings_observed": 41871
    }
   ]
  },
  "IGI": {
   "natural": [
    {
     "month": "2025-12",
     "median_usd_per_carat": 1681.57,
     "listings_observed": 27710
    },
    {
     "month": "2026-01",
     "median_usd_per_carat": 1824.18,
     "listings_observed": 22173
    },
    {
     "month": "2026-02",
     "median_usd_per_carat": 1933.01,
     "listings_observed": 50941
    },
    {
     "month": "2026-03",
     "median_usd_per_carat": 1685.86,
     "listings_observed": 76583
    },
    {
     "month": "2026-04",
     "median_usd_per_carat": 1629.41,
     "listings_observed": 86044
    },
    {
     "month": "2026-05",
     "median_usd_per_carat": 1677.5,
     "listings_observed": 82765
    },
    {
     "month": "2026-06",
     "median_usd_per_carat": 1696.97,
     "listings_observed": 80433
    },
    {
     "month": "2026-07",
     "median_usd_per_carat": 1712.82,
     "listings_observed": 81160
    },
    {
     "month": "2026-08",
     "median_usd_per_carat": 1632.94,
     "listings_observed": 78729
    }
   ],
   "lab_grown": [
    {
     "month": "2025-12",
     "median_usd_per_carat": 734.61,
     "listings_observed": 435957
    },
    {
     "month": "2026-01",
     "median_usd_per_carat": 692.61,
     "listings_observed": 471143
    },
    {
     "month": "2026-02",
     "median_usd_per_carat": 639.26,
     "listings_observed": 980082
    },
    {
     "month": "2026-03",
     "median_usd_per_carat": 539.28,
     "listings_observed": 1311713
    },
    {
     "month": "2026-04",
     "median_usd_per_carat": 510.73,
     "listings_observed": 1247699
    },
    {
     "month": "2026-05",
     "median_usd_per_carat": 523.85,
     "listings_observed": 1212565
    },
    {
     "month": "2026-06",
     "median_usd_per_carat": 487.22,
     "listings_observed": 1405834
    },
    {
     "month": "2026-07",
     "median_usd_per_carat": 503.62,
     "listings_observed": 1157800
    },
    {
     "month": "2026-08",
     "median_usd_per_carat": 445.75,
     "listings_observed": 1328362
    }
   ]
  },
  "HRD": {
   "natural": [
    {
     "month": "2025-12",
     "median_usd_per_carat": 1600.03,
     "listings_observed": 5360
    },
    {
     "month": "2026-01",
     "median_usd_per_carat": 1528.7,
     "listings_observed": 4409
    },
    {
     "month": "2026-02",
     "median_usd_per_carat": 2413.0,
     "listings_observed": 11685
    },
    {
     "month": "2026-03",
     "median_usd_per_carat": 2212.34,
     "listings_observed": 14110
    },
    {
     "month": "2026-04",
     "median_usd_per_carat": 2347.85,
     "listings_observed": 16400
    },
    {
     "month": "2026-05",
     "median_usd_per_carat": 2269.17,
     "listings_observed": 16395
    },
    {
     "month": "2026-06",
     "median_usd_per_carat": 2243.0,
     "listings_observed": 16315
    },
    {
     "month": "2026-07",
     "median_usd_per_carat": 2757.9,
     "listings_observed": 11302
    },
    {
     "month": "2026-08",
     "median_usd_per_carat": 2638.63,
     "listings_observed": 11108
    }
   ],
   "lab_grown": [
    {
     "month": "2025-12",
     "median_usd_per_carat": 589.27,
     "listings_observed": 320
    },
    {
     "month": "2026-01",
     "median_usd_per_carat": 463.52,
     "listings_observed": 227
    },
    {
     "month": "2026-02",
     "median_usd_per_carat": 698.01,
     "listings_observed": 467
    },
    {
     "month": "2026-03",
     "median_usd_per_carat": 1771.64,
     "listings_observed": 855
    },
    {
     "month": "2026-04",
     "median_usd_per_carat": 1962.74,
     "listings_observed": 614
    },
    {
     "month": "2026-05",
     "median_usd_per_carat": 2182.24,
     "listings_observed": 306
    },
    {
     "month": "2026-06",
     "median_usd_per_carat": 1750.47,
     "listings_observed": 331
    },
    {
     "month": "2026-07",
     "median_usd_per_carat": 2394.0,
     "listings_observed": 415
    },
    {
     "month": "2026-08",
     "median_usd_per_carat": null,
     "listings_observed": 145
    }
   ]
  },
  "GCAL": {
   "lab_grown": [
    {
     "month": "2025-12",
     "median_usd_per_carat": 625.12,
     "listings_observed": 570
    },
    {
     "month": "2026-01",
     "median_usd_per_carat": 648.29,
     "listings_observed": 703
    },
    {
     "month": "2026-02",
     "median_usd_per_carat": 1319.15,
     "listings_observed": 4385
    },
    {
     "month": "2026-03",
     "median_usd_per_carat": 1210.35,
     "listings_observed": 7116
    },
    {
     "month": "2026-04",
     "median_usd_per_carat": 1127.32,
     "listings_observed": 6577
    },
    {
     "month": "2026-05",
     "median_usd_per_carat": 1392.56,
     "listings_observed": 7406
    },
    {
     "month": "2026-06",
     "median_usd_per_carat": 1207.65,
     "listings_observed": 11116
    },
    {
     "month": "2026-07",
     "median_usd_per_carat": 851.57,
     "listings_observed": 8635
    },
    {
     "month": "2026-08",
     "median_usd_per_carat": 1059.27,
     "listings_observed": 10477
    }
   ]
  },
  "EGL": {
   "natural": [
    {
     "month": "2025-12",
     "median_usd_per_carat": 2418.0,
     "listings_observed": 183
    },
    {
     "month": "2026-01",
     "median_usd_per_carat": null,
     "listings_observed": 69
    },
    {
     "month": "2026-02",
     "median_usd_per_carat": 3126.19,
     "listings_observed": 209
    },
    {
     "month": "2026-03",
     "median_usd_per_carat": 2676.96,
     "listings_observed": 365
    },
    {
     "month": "2026-04",
     "median_usd_per_carat": 2992.71,
     "listings_observed": 354
    },
    {
     "month": "2026-05",
     "median_usd_per_carat": 3022.22,
     "listings_observed": 277
    },
    {
     "month": "2026-06",
     "median_usd_per_carat": 2751.55,
     "listings_observed": 406
    },
    {
     "month": "2026-07",
     "median_usd_per_carat": 2937.05,
     "listings_observed": 285
    },
    {
     "month": "2026-08",
     "median_usd_per_carat": 2701.51,
     "listings_observed": 210
    }
   ]
  },
  "OTHER": {
   "natural": [
    {
     "month": "2025-12",
     "median_usd_per_carat": 2273.62,
     "listings_observed": 5760
    },
    {
     "month": "2026-01",
     "median_usd_per_carat": 2740.0,
     "listings_observed": 4164
    },
    {
     "month": "2026-02",
     "median_usd_per_carat": 3842.0,
     "listings_observed": 13489
    },
    {
     "month": "2026-03",
     "median_usd_per_carat": 2940.3,
     "listings_observed": 12697
    },
    {
     "month": "2026-04",
     "median_usd_per_carat": 2486.63,
     "listings_observed": 13094
    },
    {
     "month": "2026-05",
     "median_usd_per_carat": 2467.3,
     "listings_observed": 12948
    },
    {
     "month": "2026-06",
     "median_usd_per_carat": 2421.0,
     "listings_observed": 12003
    },
    {
     "month": "2026-07",
     "median_usd_per_carat": 2822.0,
     "listings_observed": 50163
    },
    {
     "month": "2026-08",
     "median_usd_per_carat": 2490.0,
     "listings_observed": 37739
    }
   ],
   "lab_grown": [
    {
     "month": "2025-12",
     "median_usd_per_carat": 1180.0,
     "listings_observed": 45669
    },
    {
     "month": "2026-01",
     "median_usd_per_carat": 1041.67,
     "listings_observed": 35192
    },
    {
     "month": "2026-02",
     "median_usd_per_carat": 950.74,
     "listings_observed": 28203
    },
    {
     "month": "2026-03",
     "median_usd_per_carat": 588.87,
     "listings_observed": 33277
    },
    {
     "month": "2026-04",
     "median_usd_per_carat": 744.7,
     "listings_observed": 35990
    },
    {
     "month": "2026-05",
     "median_usd_per_carat": 737.07,
     "listings_observed": 44496
    },
    {
     "month": "2026-06",
     "median_usd_per_carat": 582.84,
     "listings_observed": 29231
    },
    {
     "month": "2026-07",
     "median_usd_per_carat": 1661.89,
     "listings_observed": 51052
    },
    {
     "month": "2026-08",
     "median_usd_per_carat": 1045.45,
     "listings_observed": 43890
    }
   ]
  }
 },
 "lab_vs_natural": [
  {
   "month": "2025-12",
   "natural": 2193.75,
   "lab_grown": 783.62,
   "natural_over_lab_ratio": 2.8,
   "natural_premium_pct": 180.0
  },
  {
   "month": "2026-01",
   "natural": 2238.61,
   "lab_grown": 715.58,
   "natural_over_lab_ratio": 3.1,
   "natural_premium_pct": 212.8
  },
  {
   "month": "2026-02",
   "natural": 2328.75,
   "lab_grown": 665.5,
   "natural_over_lab_ratio": 3.5,
   "natural_premium_pct": 249.9
  },
  {
   "month": "2026-03",
   "natural": 2221.53,
   "lab_grown": 560.32,
   "natural_over_lab_ratio": 4.0,
   "natural_premium_pct": 296.5
  },
  {
   "month": "2026-04",
   "natural": 2213.78,
   "lab_grown": 534.55,
   "natural_over_lab_ratio": 4.1,
   "natural_premium_pct": 314.1
  },
  {
   "month": "2026-05",
   "natural": 2230.76,
   "lab_grown": 543.38,
   "natural_over_lab_ratio": 4.1,
   "natural_premium_pct": 310.5
  },
  {
   "month": "2026-06",
   "natural": 2249.71,
   "lab_grown": 500.91,
   "natural_over_lab_ratio": 4.5,
   "natural_premium_pct": 349.1
  },
  {
   "month": "2026-07",
   "natural": 2296.54,
   "lab_grown": 528.66,
   "natural_over_lab_ratio": 4.3,
   "natural_premium_pct": 334.4
  },
  {
   "month": "2026-08",
   "natural": 2184.28,
   "lab_grown": 464.15,
   "natural_over_lab_ratio": 4.7,
   "natural_premium_pct": 370.6
  }
 ]
}