Open data
Open data
Lab-grown versus natural, over time.
How the median price per carat of natural and lab-grown diamonds has moved month by month, and the premium natural still commands. Open data, updated monthly.
Natural · median / ct
$2,253
Lab-grown · median / ct
$505
Natural premium now
345.8%
4.5×
Natural
Lab-grown
Dec ’25Jan ’26Feb ’26Mar ’26Apr ’26May ’26Jun ’26
Each point is the median USD per carat from a systematic 1-in-10 sample of listings, one observation per listing per calendar month, in pinned-rate USD. Cells below 150 sampled stones in a month are withheld rather than shown.
Full monthly series
| Month | Natural | Lab-grown | Natural premium |
|---|---|---|---|
| 2026-06 | $2,253 | $505 | 345.8% |
| 2026-05 | $2,259 | $547 | 313.4% |
| 2026-04 | $2,253 | $540 | 317.1% |
| 2026-03 | $2,213 | $556 | 298.2% |
| 2026-02 | $2,324 | $658 | 253.2% |
| 2026-01 | $2,174 | $697 | 212.1% |
| 2025-12 | $2,147 | $758 | 183.3% |
Cite as: Caratlytics Diamond Price Index, 2026-06, caratlytics.com. Licensed CC BY 4.0.