1.5 Carat Round Lab Grown Diamond Price

RINGS.COM RESEARCH & DATA

Rings.com Research

1.5 Carat Round Lab Grown Diamond Price

As of October 2026, a 1.5 carat round lab grown diamond lists at a median of $660 across 6 US retailers (5 with third-party certificates, plus VRAI, which grades in-house), from 46,622 public listings.

Source: the Rings.com Lab-Grown Diamond Price Index. Methodology and monthly benchmark: Lab Grown Diamond Price Per Carat.

How the Price Index is calculated · Which retailers are included and why · About this page's data

Data as of October 2026, captured October 24, 2026, published October 25, 2026. Updated monthly, next update November 2026. USD.

$660median, 1.5 carat round lab grown diamond
$394 to $1,510typical range, 10th to 90th percentile
$432median price per carat
46,622public listings, 6 retailers

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Key figures in words, October 2026 (for quoting)
  • As of October 2026, the median 1.5 carat round lab grown diamond listed for $660 across 6 US retailers (5 with third-party certificates, plus VRAI, which grades in-house), from 46,622 public listings.
  • In October 2026, the middle 80% of 1.5 carat round lab grown diamond listings ran from $394 to $1,510 (10th to 90th percentile), and the median price per carat was $432.
  • In October 2026, among retailers with third-party certificates, the lowest retailer median for a 1.5 carat round lab grown diamond was $419 at Ritani and the highest was $1,477 at Blue Nile, a 3.5x spread.
  • The September 2026 pooled median for this carat range was $680 from 49,771 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 (October 2026)

Retailer Median listed price Listings (n)
Blue Nile $1,477 2,296
Brilliant Earth $1,370 7,616
Clean Origin $575 2,693
Grown Brilliance $770 14,435
Ritani $419 19,485
VRAI † $1,830 97

† VRAI grades in-house and does not carry third-party (IGI/GIA) certificates; its figures are shown for context and are not directly comparable.

Certified stones at this size

5 of the 23 stones we track at this size that have a page here, with the price range across retailers. They are the 5 nearest this page's median price, but all 5 are D color with IF clarity. Their median listed prices are about 4.4 times the page median, so they sit well above this page's median of $660, which pools all grades. The stones we track across retailers are not a random sample: they lean toward stones that retailers price very differently.

Listed prices as of October 24, 2026, not quotes; a stone may have sold or been repriced since. Loose stones only. This is not a recommendation of any retailer.

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
October 2026 $660 46,622 6

Each month pools only retailers with at least 30 qualifying listings that month (the same rule as the headline figures above), so the October 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 October 24, 2026 (October 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 October 24, 2026. Re-checked on the index's collection cycle (currently monthly; weekly refresh rolling out).
  • Brilliant Earth: last verified in its public listings on October 24, 2026. Re-checked on the index's collection cycle (currently monthly; weekly refresh rolling out).
  • Clean Origin: last verified in its public listings on October 24, 2026. Re-checked on the index's collection cycle (currently monthly; weekly refresh rolling out).
  • Grown Brilliance: last verified in its public listings on October 24, 2026. Re-checked on the index's collection cycle (currently monthly; weekly refresh rolling out).
  • Ritani: last verified in its public listings on October 24, 2026. Re-checked on the index's collection cycle (currently monthly; weekly refresh rolling out).
  • VRAI: last verified in its public listings on October 24, 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 October 24, 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.

Updated monthly.

Rings.com Lab-Grown Diamond Price Index