Loose 3 Carat Diamonds

3 Carat Diamond Prices: Natural Stones by Grade

A natural 3 carat diamond at Rare Carat starts at $6,840 today, with the current savings applied, and the median is $30,583. Nine in ten sell for under $50,661, and the top of the range is $143,660. The grid above holds 111,891 diamonds between 2.90 and 3.10 carats, 5,671 natural and 106,220 lab grown; this guide is about the natural ones. Rounds account for 1,760 of them, starting at $7,565 with a median of $29,715. For the same weight in lab grown, the median is $2,753, a difference so large that the two are best treated as separate purchases rather than alternatives, and the 3 carat lab grown diamonds page handles the other one.

Natural inventory at three carats is a few thousand stones rather than tens of thousands, so individual diamonds move the averages. The figures here are a snapshot of Rare Carat inventory on October 16, 2026: counts include every natural stone in the band, with or without video (4,687 have 360 HD video), and every count and price covers the same set the grid shows (D to K color, FL to SI2 clarity, Good cut or better). The filters on the grid above will show you the live equivalents of every table.

Why 3 Carat Natural Diamonds Cost So Much More per Carat

Rough crystals large enough to yield a clean three carat polished stone are rare, and the price per carat climbs accordingly. On the same day, the median natural round was $2,841 at one carat, $13,432 at two carats and $29,715 at three. Per carat, that is $2,841, $6,716 and $9,905. The three carat stone is not three times the one carat stone; it is roughly 10 times, and the extra is paid for rarity rather than for anything you can measure with a loupe. That is also why small concessions on color and clarity save so much at this size.

Natural rounds, median price by carat, same day and same basis (X.90 to X.10 ct bands)

Color and Clarity Choices at 3 Carats

Holding clarity at VS2 in rounds, J color starts at $12,305, I at $18,190, H at $23,125, G at $24,155, F at $29,205 and D at $33,150. At this size the warmth of an I or J stone is easier to see than at one carat, especially in a platinum setting, so H is the practical floor for white metal and I works in yellow gold. On clarity, with color held at G to H, SI2 opens at $12,130, SI1 at $17,685, VS2 at $23,125, VS1 at $25,030 and VVS2 at $24,260. The SI2 discount is large because at three carats an SI2 inclusion is usually visible; SI1 can be a good buy if the 360 video shows the inclusion off to the side, and VS2 is clean to the eye in almost every stone.

Rounds, 2.90 to 3.10 ct: color at VS2 clarity (293 D to K rounds), and clarity at G to H color (452 rounds)

Fluorescence, Cut and the Report on a Big Stone

Three things deserve more attention at three carats than at one. Fluorescence first: 1,196 of the 1,760 rounds here have none, and the rest range from faint to strong. Faint is harmless and often a small discount; strong blue fluorescence in a D to F stone can give a hazy look in daylight, which the fluorescence guide explains with photos. Cut second: an Excellent cut on a 3 carat diamond is the difference between a stone that lights up a room and one that looks glassy, and the Rare Carat Ideal filter narrows the grid to the proportions that perform. Report third: 4,833 of the 5,671 three carat natural stones with video are GIA graded and 838 are IGI graded; for a natural stone at this price, a GIA report is the standard, and our New York staff match the inscription on the girdle to the report number under a microscope after you order.

3 Carat Shapes and Measurements

A 3 carat round measures about 9.3 to 9.4 mm; a 3 carat oval roughly 11.5 by 8.5 mm; an emerald cut 9.5 by 7.5 mm; a cushion 8.5 to 9 mm. Ovals are the entry point at this weight ($6,840), and princess cuts carry the lowest median at $22,579, against $29,715 for a round. The ten rows add up to the 5,671 natural stones on this page.

2.90 to 3.10 ct natural, every stone the grid shows (D to K color, SI2 or better clarity, Good cut or better), prices you pay today

Lab Grown as the 3 Carat Alternative

A natural G color VS1 round of three carats starts at $30,860 here, with 33 in stock and a median of $39,494. The lab grown stone of the same grade starts at $1,945, with 407 to choose from. For H color SI1, natural opens at $17,685 and lab at $1,405. Both are diamond, both are graded on the same scale and both pass through the same inspection in New York. Which one is right is a question about what you want the stone to be, not about how it will look on the hand.

Natural vs lab grown, 2.90 to 3.10 ct rounds

What to Expect When You Order a 3 Carat Diamond

Rare Carat is the merchant of record, so the order, the inspection, the shipping and the aftercare all run through us. The diamond travels to our New York facility, where staff examine it under a microscope and confirm the laser inscription matches the report before it ships, free and fully insured. Returns are free for 30 days, resizing is free for the first year, and every ring carries a lifetime manufacturing warranty. Checkout offers Affirm, Klarna, Afterpay, PayPal Pay Later and Katapult for anyone who prefers monthly payments. Our gemologists will compare your finalists by chat or phone without commission, which at this price is worth taking them up on. Rare Carat stocks more than 2 million natural and lab grown diamonds, is rated 5 out of 5 on Google and Trustpilot, and sits at the top of Trustpilot's jewelry brands in America.

On weight: G to H color rounds in VS2 to SI1 clarity have a median of $23,124 between 2.90 and 2.99 carats and $35,820 between 3.00 and 3.10, so the three carat mark carries a premium of about 55 percent at the median for a stone 0.2 mm wider. Above it, our 3.5 carat diamonds start at $28,395 for the same grade, and the 2.5 carat diamonds page is the step below.

Natural diamonds by carat band, all shapes: the first two rows are the 5,671 natural stones on this page

Counts and prices cover every natural diamond between 2.90 and 3.10 carats in Rare Carat inventory on October 16, 2026 that the grid on this page shows: all shapes, D to K color, FL to SI2 clarity, Good cut or better, GIA, IGI or GCAL graded, with or without video (5,671 stones, 4,687 with 360 HD video). Prices reflect the current savings, which are applied automatically; each stone also shows its regular price struck through. Starting prices refer to the lowest priced stone in each group. The grid total of 111,891 adds the 106,220 lab grown stones in the same band. One and two carat comparisons use the same day and basis. Face-up measurements are averages for well cut stones.