FACETWIREPrice IntelligenceThe Facet Wire Diamond Price Index
Edition: 2026-10-17 — baseline edition. The Index tracks median per-carat prices across 541 live listings (509 lab-grown, 32 natural) at 5 retailers, rebuilt from a fresh scrape every week. This first edition sets the baseline; week-over-week movement starts next week.
Median $/carat by shape (lab-grown)
| Shape | Listings | Median $/ct | Median price | Cheapest retailer (median $/ct) |
|---|---|---|---|---|
| Round | 75 | $922 | $2,072 | With Clarity ($519/ct) |
| Pear | 211 | $850 | $1,973 | Blue Nile ($648/ct) |
| Marquise | 177 | $762 | $1,552 | With Clarity ($630/ct) |
| Heart | 46 | $583 | $688 | Ritani ($332/ct) |
Biggest live price gaps (same-spec stones)
Facet Wire matches stones spec-for-spec — same shape, carat, color, clarity and cut — across retailers. These are the widest live spreads in the current data. Same stone specs, wildly different prices:
| Stone | Cheapest | Priciest | Spread |
|---|---|---|---|
| 2.79 ct Pear D/VVS2 (Lab-Grown) | With Clarity — $1,668 | Ada Diamonds — $6,025 | $4,357 (72%) |
| 2.73 ct Marquise E/VVS1 (Lab-Grown) | With Clarity — $2,156 | Frank Darling — $6,121 | $3,965 (65%) |
| 4.59 ct Pear E/VS1 (Lab-Grown) | With Clarity — $2,595 | Frank Darling — $5,677 | $3,082 (54%) |
| 4.09 ct Marquise F/VVS2 (Lab-Grown) | With Clarity — $2,445 | Frank Darling — $5,487 | $3,042 (55%) |
| 3.52 ct Marquise E/VVS2 (Lab-Grown) | With Clarity — $2,286 | Frank Darling — $5,155 | $2,869 (56%) |
How the Index is built
Every night Facet Wire scrapes its retailer set and rebuilds its listing database. Once a week the Index is recomputed from that data: medians (never averages — medians resist outlier listings), per-carat normalization so shapes compare fairly, and spec-for-spec gap matching. Listings under $100 are excluded as data errors. Retailer "cheapest" calls require at least 5 listings in the shape so a single cheap stone can't win a category.
Spotted a price we missed? The full live database is searchable — search all listings — and jewelers can track competitors continuously with Facet Wire Pro.