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Round diamonds, Oct 2, 2026
Brilliant Earth listings, read Oct 2, 2026. See source
| If you are asking | Start with | Link |
|---|---|---|
| Budget set, weight open? | Median price by carat band | Price by carat |
| Torn between natural and lab? | Matched stones, same day | See pairs |
| Looking near 1 carat? | Check just under the round number | Carat guide |
| Ready to browse stones? | Open the jewelers' round listings | See listings |
Origin. At the same weight and grades, the laboratory-grown stones we matched were listed at 12 to 18 percent of the natural price at 1.5 to 2 carats: a 2.00 carat I VS2 Super Ideal round at Brilliant Earth was $15,050 natural and $1,930 laboratory-grown12.
Weight. Price rises faster than weight. Among the natural rounds we read at Brilliant Earth, the median was $4,750 around 1 carat and $14,920 around 2 carats: about three times the price for twice the weight1.
Colour and clarity. Within one weight band the spread is wide. Natural rounds between 0.90 and 1.09 carats ran from $1,780 to $11,110 on the same page that morning1. A higher colour or clarity grade costs more, and the difference is often hard to see once the stone is set.
What to check. The grading report (laboratory and report number), the cut grade, the return window and whether a sale price has an end date. Blue Nile, for example, states free returns on eligible items within 30 days of shipment; engraved, custom and resized items are excluded4.
| Weight band | Natural (median, listings read) | Laboratory-grown (median, listings read) |
|---|---|---|
| 0.90 to 1.09 ct1 | $4,750 (19) | $475 (2) |
| 1.40 to 1.59 ct1 | $8,415 (6) | $1,165 (8) |
| 1.90 to 2.19 ct1 | $14,920 (12) | $1,950 (25) |
| 2.90 to 3.19 ct2 | $23,615 (2) | $3,435 (12) |
| Source | Brilliant Earth natural roundsRead Oct 2, 2026 | Brilliant Earth lab roundsRead Oct 2, 2026 |
Medians are computed from the listings we read on October 2, 2026 (the first ~100 listings of each merchant page in its default order, all colour and clarity grades mixed). They show the spread on that page that morning, not a market average.
| Stone | Natural | Laboratory-grown | Merchant |
|---|---|---|---|
| About 1.5 ct, H, VS2, Super Ideal1 | $7,590 (1.50 ct) | $1,380 (1.52 ct) | Brilliant Earth |
| 2.00 ct, I, VS2, Super Ideal1 | $15,050 | $1,930 | Brilliant Earth |
| About 2 ct, F, VVS2, Super Ideal1 | $25,780 (2.02 ct) | $3,380 (2.05 ct) | Brilliant Earth |
| 1.50 ct, Excellent cut3 | $9,696 (GIA, F VS1) | $1,011 (IGI, D VS1) | Blue Nile |
| 1.00 ct, Very Good cut, D, VS25 | Not stated by the source | $360 | Clean Origin |
| Source | Jewelers' natural listingsRead Oct 2, 2026 | Jewelers' lab listingsRead Oct 2, 2026 | Brilliant Earth, Blue Nile, Clean OriginRead Oct 2, 2026 |
Prices as listed on October 2, 2026, before tax, without a setting. Clean Origin's natural round was not in the listings we read.
How these links work: each button opens the merchant's own product page. We are not paid for these links today; we may earn a commission from purchases in the future.
Good for GIA-graded natural rounds with natural and lab tabs
Good for comparing natural and lab-grown rounds on one site
Also on Brilliant Earth's site
Laboratory and report number. Most natural stones we read named GIA, most lab-grown IGI at Blue Nile3.
Each jeweler names its own scale: Excellent, Ideal, Super Ideal.
0.90 to 0.99 ct can cost far less than 1.00 ct. See the carat guide.
Blue Nile: 30 days from shipment on eligible items4.
Often yes, because buyers pay for the round number. Our carat weight guide shows the step we saw at 1.00 carat.
The listings we read named GIA for most natural stones and IGI for most laboratory-grown stones at Blue Nile3. Ask for the report number and look it up on the laboratory's site before you pay.
We do not earn anything from purchases today. Every product link is a plain link to the merchant's own page, without an affiliate code. We may join merchants' affiliate programs in the future, and this notice will say so before that changes.
Diamond listings change by the hour: stones sell, prices move and sales start and end. Every price here is the merchant's listed price on the date shown. The merchant's own page is the final word on price, availability and terms.
RingPrice Index does not sell jewelry, does not grade stones and does not take your details. We read merchants' public listing pages and report what they showed.
