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
$2,184
Lab-grown · median / ct
$464
Natural premium now
370.6%
4.7×
Natural
Lab-grown
Dec ’25Jan ’26Feb ’26Mar ’26Apr ’26May ’26Jun ’26Jul ’26Aug ’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 |
|---|---|---|---|
| 2026-08 | $2,184 | $464 | 370.6% |
| 2026-07 | $2,297 | $529 | 334.4% |
| 2026-06 | $2,250 | $501 | 349.1% |
| 2026-05 | $2,231 | $543 | 310.5% |
| 2026-04 | $2,214 | $535 | 314.1% |
| 2026-03 | $2,222 | $560 | 296.5% |
| 2026-02 | $2,329 | $666 | 249.9% |
| 2026-01 | $2,239 | $716 | 212.8% |
| 2025-12 | $2,194 | $784 | 180% |
Cite as: Caratlytics Diamond Price Index, 2026-08, caratlytics.com. Licensed CC BY 4.0.