FACETWIREPrice IntelligenceThe Facet Wire Diamond Price Index
Edition: 2026-10-18 — baseline edition. The Index tracks median per-carat prices across 1997 live listings (1470 lab-grown, 527 natural) at 10 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) |
|---|---|---|---|---|
| Cushion | 74 | $1,206 | $2,095 | With Clarity ($572/ct) |
| Emerald | 90 | $873 | $1,612 | Friendly Diamonds ($446/ct) |
| Radiant | 86 | $799 | $1,345 | With Clarity ($409/ct) |
| Marquise | 282 | $733 | $1,320 | Ritani ($391/ct) |
| Oval | 193 | $717 | $1,240 | Ritani ($408/ct) |
| Pear | 301 | $697 | $1,358 | Friendly Diamonds ($382/ct) |
| Round | 308 | $673 | $1,070 | Ritani ($373/ct) |
| Princess † | 24 | $649 | $1,366 | MiaDonna ($530/ct) |
| Heart | 49 | $596 | $693 | Ritani ($332/ct) |
† Low sample — fewer than 30 tracked listings; treat this median as indicative only. Low-sample shapes are excluded from the quotable figures below.
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 |
|---|---|---|---|
| 1.08 ct Radiant E/VVS2 (Natural) | With Clarity — $4,267 | Blue Nile — $10,526 | $6,259 (59%) |
| 2.77 ct Pear E/VVS2 (Lab-Grown) | Ritani — $954 | Ada Diamonds — $5,525 | $4,571 (83%) |
| 2.52 ct Pear D/VVS1 (Lab-Grown) | Ritani — $1,358 | Frank Darling — $5,797 | $4,439 (77%) |
| 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%) |
Key figures (for quoting)
- As of 2026-10-18, Facet Wire tracks 1997 live diamond listings (1470 lab-grown, 527 natural) across 10 retailers; the median lab-grown stone costs $1,288 ($721 per carat).
- The median lab-grown round diamond tracked by Facet Wire costs $673 per carat (median stone $1,070), across 308 live listings at 9 retailers, as of 2026-10-18.
- The median lab-grown pear diamond tracked by Facet Wire costs $697 per carat (median stone $1,358), across 301 live listings at 8 retailers, as of 2026-10-18.
- The median lab-grown marquise diamond tracked by Facet Wire costs $733 per carat (median stone $1,320), across 282 live listings at 8 retailers, as of 2026-10-18.
- The widest live same-spec price gap in the current data is $6,259 on a 1.08 ct Radiant (E/VVS2, Natural): $4,267 at With Clarity versus $10,526 at Blue Nile.
Cite as: Facet Wire Diamond Price Index, 2026-10-18, facetwire.com/price-index/
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. The full matching rules are published at How Facet Wire matches diamonds.
Spotted a price we missed? The full live database is searchable — search all listings — and jewelers can track competitors continuously with Facet Wire Pro.