1.5 Carat Round Lab Grown Diamond Price
Rings.com Research
1.5 Carat Round Lab Grown Diamond Price
As of September 2026, a 1.5 carat round lab grown diamond lists at a median of $680 across 6 US retailers (5 with third-party certificates, plus VRAI, which grades in-house), from 49,771 public listings.
Source: the Rings.com Lab-Grown Diamond Price Index. Methodology and monthly benchmark: Lab Grown Diamond Price Per Carat.
Data as of September 2026, captured September 17, 2026. Updated monthly, next update October 2026. USD.
Key figures in words, September 2026 (for quoting)
- As of September 2026, the median 1.5 carat round lab grown diamond listed for $680 across 6 US retailers (5 with third-party certificates, plus VRAI, which grades in-house), from 49,771 public listings.
- In September 2026, the middle 80% of 1.5 carat round lab grown diamond listings ran from $382 to $1,580 (10th to 90th percentile), and the median price per carat was $468.
- In September 2026, among retailers with third-party certificates, the lowest retailer median for a 1.5 carat round lab grown diamond was $424 at Ritani and the highest was $1,471 at Blue Nile, a 3.5x spread.
- The August 2026 pooled median for this carat range was $960 from 47,458 listings; pooled medians move with inventory mix as well as price.
Carat range for this page: 1.41 to 1.59 ct, round shape, all colors and clarities pooled.
Median 1.5 carat round price by retailer (September 2026)
| Retailer | Median listed price | Listings (n) |
|---|---|---|
| Blue Nile | $1,471 | 2,332 |
| Brilliant Earth | $1,410 | 6,890 |
| Clean Origin | $428 | 5,837 |
| Grown Brilliance | $1,065 | 15,452 |
| Ritani | $424 | 19,169 |
| VRAI † | $1,810 | 91 |
† VRAI grades in-house and does not carry third-party (IGI/GIA) certificates; its figures are shown for context and are not directly comparable.
Monthly price history
| Month | Pooled median | Listings (n) | Retailers |
|---|---|---|---|
| April 2026 | $1,140 | 69,978 | 5 |
| May 2026 | $1,145 | 77,606 | 6 |
| June 2026 | $333 | 34,833 | 6 |
| July 2026 | $473 | 34,614 | 6 |
| August 2026 | $960 | 47,458 | 6 |
| September 2026 | $680 | 49,771 | 6 |
Each month pools only retailers with at least 30 qualifying listings that month (the same rule as the headline figures above), so the September 2026 row matches this page's headline.
Coverage note. June 2026 was a partial collection cycle for Ritani; June rows pool fewer Ritani listings than adjacent months.
Composition caveat. Monthly medians reflect the mix of stones listed each month as well as pricing: inventory shifts move these numbers alongside true price changes. Month-to-month moves here are directional context, not a price series.
Stat definition. Figures on this page pool all qualifying listings in the stated carat range: all colors, clarities, and cut grades, from retailers with at least 30 qualifying listings. The monthly Index benchmark is a different, tighter statistic (E VS1 round Excellent-cut IGI). The two are not comparable and should not be quoted against each other.
Loose stones only. Every figure on this page is for a loose lab grown diamond as listed, before any ring setting. No blended ring-total pricing appears on this page; setting costs vary by retailer and are never merged into these comparisons.
How current are these prices?
Every price on this page was captured from public retailer listings on September 17, 2026 (September 2026 collection cycle) and is accurate as of that date only. Retailers reprice and delist stones continuously, so any listing shown here may have sold, been delisted, or changed price since capture.
- Blue Nile: last verified in its public listings on September 17, 2026. Re-checked on the index's collection cycle (currently monthly; weekly refresh rolling out).
- Brilliant Earth: last verified in its public listings on September 17, 2026. Re-checked on the index's collection cycle (currently monthly; weekly refresh rolling out).
- Clean Origin: last verified in its public listings on September 17, 2026. Re-checked on the index's collection cycle (currently monthly; weekly refresh rolling out).
- Grown Brilliance: last verified in its public listings on September 17, 2026. Re-checked on the index's collection cycle (currently monthly; weekly refresh rolling out).
- Ritani: last verified in its public listings on September 17, 2026. Re-checked on the index's collection cycle (currently monthly; weekly refresh rolling out).
- VRAI: last verified in its public listings on September 17, 2026. Re-checked on the index's collection cycle (currently monthly; weekly refresh rolling out).
About this data
Prices are publicly listed retail prices for loose lab grown diamonds, collected from each retailer's public website on September 17, 2026. No accounts, logins, or paywalls are involved; these are the prices any shopper sees. Rings.com is an independent research publisher, not a jewelry retailer, and publishes this data as an attributed, dated record of public listing prices. Retailer names are used for identification only; Rings.com is not affiliated with any retailer listed.
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Rings.com Lab-Grown Diamond Price Index