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
$2,325
Lab-grown · median / ct
$536
Natural premium now
333.9%
4.3×
Natural
Lab-grown
Dec ’25Jan ’26Feb ’26Mar ’26Apr ’26May ’26Jun ’26Jul ’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 |
|---|---|---|---|
| 2026-07 | $2,325 | $536 | 333.9% |
| 2026-06 | $2,253 | $505 | 346.2% |
| 2026-05 | $2,258 | $545 | 314% |
| 2026-04 | $2,251 | $539 | 317.7% |
| 2026-03 | $2,211 | $554 | 299% |
| 2026-02 | $2,324 | $658 | 253.4% |
| 2026-01 | $2,174 | $696 | 212.2% |
| 2025-12 | $2,147 | $758 | 183.4% |
Cite as: Caratlytics Diamond Price Index, 2026-07, caratlytics.com. Licensed CC BY 4.0.