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Carat Hunter · Where to buy diamonds

Where to buy a 3ct lab-grown round diamond

Every retailer in our index stocking this size and shape, 68 of them, across 491,632 current listings.

Updated November 6, 2026 · Independent. Zero affiliate revenue.

The market at this size and shape

Active listings

491,632

Retailers carrying

68

Median confirmed price

$762

Grade combinations

52

Certificate mix:IGI 447,933 · GIA 26,406 · GCAL 5,154 · HRD 36 · AGS 2

What it actually costs

Half of these diamonds are listed between $541 and $1,318 (as of November 6, 2026).

Lower 10% $459Median $762Upper 10% $2,593

Middle half listed between $541 to $1,318

Certificated stones with a recently confirmed price only, 39,585 of them. Each contributes its cheapest confirmed price.

The same stone, priced differently

As of November 5, 2026, the same certified diamond typically costs 44% more at a typical retailer than at the cheapest for lab-grown stones, and 19% more for natural ones (the median across stones listed by two or more retailers). Comparing shows you the cheapest of the retailers listing the same stone.

Every retailer that stocks this spec

Ranked by active inventory count. Selection is mechanical, not editorial.

  1. 1Carbon Sparkle32,116 in stock
    United States·GCAL, GIA, IGI·21-day returns·Ships to United States
    Terms read on the retailer’s own site, September 2, 2026
    Visit Carbon Sparkle
  2. 2NZ Jewellers31,693 in stock
    New Zealand·Founded 2006·EGL, GCAL, GIA, HRD·30-day returns·Ships to United States
    Terms read on the retailer’s own site, October 19, 2026
    Visit NZ Jewellers
  3. 3

    The Perfect Carat

    27,254 in stock
    US·EGL, GCAL, GIA, HRD·Ships to United States
    Terms not yet verified
  4. 4Aurelinne24,994 in stock
    United States·Founded 2021·GCAL, GIA, IGI·Ships to United States
    Terms not yet verified
    Visit Aurelinne
  9. 9B2C Jewels17,657 in stock
    United States·Founded 2004·AGS, GCAL, GIA, IGI·30-day returns·Ships to United States
    Terms read on the retailer’s own site, October 19, 2026
    Visit B2C Jewels
  10. 10Adiamor16,605 in stock
    United States·Founded 1999·GCAL, GIA, IGI·Ships to United States
    Terms not yet verified
    Visit Adiamor
Show 58 more retailers
  1. 11Rare Carat16,342 in stock
    United States·Founded 2016·GCAL, GIA, IGI·30-day returns·Ships to United States
    Terms read on the retailer’s own site, October 19, 2026
    Visit Rare Carat
  3. 13RockHer15,314 in stock
    United States·Founded 2016·GIA, IGI·Ships to United States
    Terms not yet verified
    Visit RockHer
  6. 16Moon Ocean14,068 in stock
    United Kingdom·Founded 2022·GCAL, GIA, IGI·Ships to United States
    Terms not yet verified
    Visit Moon Ocean
  9. 19Yorxs11,053 in stock
    Germany·Founded 2011·GIA, HRD, IGI
    Terms not yet verified
    Visit Yorxs
  10. 20Cape Diamonds10,628 in stock
    South Africa·Founded 2005·GIA, IGI·7-day returns·Ships to United States
    Terms read on the retailer’s own site, June 15, 2026
    Visit Cape Diamonds
  23. 33The Diamond Guys3,994 in stock
    United States·Founded 2005·GCAL, GIA, IGI·15-day returns·Ships to United States
    Terms read on the retailer’s own site, June 15, 2026
    Visit The Diamond Guys
  27. 37

    GemTrove

    3,146 in stock
    AU·GCAL, GIA, IGI
    Terms not yet verified
  28. 38GemsNY2,970 in stock
    United States·Founded 1988·GCAL, GIA, IGI·Ships to United States
    Terms not yet verified
    Visit GemsNY
  29. 39Blue Nile1,939 in stock
    United States·Founded 1999·GCAL, GIA, IGI·Ships to United States
    Terms not yet verified
    Visit Blue Nile
  30. 40Allurez1,357 in stock
    United States·Founded 2010·GCAL, GIA, IGI·Ships to United States
    Terms not yet verified
    Visit Allurez
  34. 44Jared912 in stock
    United States·Founded 1993·GCAL, GIA, IGI·Ships to United States
    Terms not yet verified
    Visit Jared
  36. 46Zales834 in stock
    United States·Founded 1924·GCAL, GIA, IGI·Ships to United States
    Terms not yet verified
    Visit Zales
  41. 5125karats181 in stock
    United States·Founded 2008·IGI·60-day returns·Ships to United States
    Terms read on the retailer’s own site, June 15, 2026
    Visit 25karats
  42. 52RDI Diamonds118 in stock
    United States·Founded 1992·GIA, IGI·Ships to United States
    Terms read on the retailer’s own site, June 15, 2026
    Visit RDI Diamonds
  43. 53ZCOVA114 in stock
    Malaysia·Founded 2015·IGI·Ships to United States
    Terms not yet verified
    Visit ZCOVA
  46. 56Shane Co43 in stock
    United States·Founded 1971·IGI·Ships to United States
    Terms not yet verified
    Visit Shane Co
  48. 58VRAI21 in stock
    United States·Founded 2014·IGI·Ships to United States
    Terms not yet verified
    Visit VRAI
  50. 60

    Diamond Culture

    10 in stock
    HK·IGI
    Terms not yet verified
  51. 61

    Whiteflash

    9 in stock
    US·IGI·Ships to United States
    Terms not yet verified
  53. 63

    Diamovida

    3 in stock
    CA·IGI
    Terms not yet verified
  56. 66

    Good Old Gold

    1 in stock
    US·IGI·Ships to United States
    Terms not yet verified
  57. 67

    Lauren B

    1 in stock
    US·Ships to United States
    Terms not yet verified

Stock counts reflect current listings. Founded and shipping details come from public sources. Return terms are our summary of each retailer's own policy page, dated per retailer above. Retailers change their terms, so check the retailer's own returns and shipping pages before you buy.

54 of the 64 retailers with shipping details ship to United States. 10 do not. 4 retailers have not published any shipping details.

Narrow it down by grade

Each combination below has its own page with the retailers that stock exactly that grade.

E VVS2114,864 · 62rF VVS268,120 · 58rE VS161,178 · 60rF VS137,860 · 52rD VVS236,416 · 57rD VS127,927 · 61rD VVS118,944 · 56rE VVS114,654 · 55rG VVS213,866 · 52rE VS213,680 · 50rD IF11,638 · 52rG VS110,025 · 48rF VVS19,390 · 57rF VS28,965 · 49rD FL8,474 · 44rD VS27,621 · 47rJ VS14,802 · 28rG VS22,522 · 44rH VVS22,488 · 45rE IF2,427 · 45rE SI12,137 · 35rG VVS11,912 · 44rH VS11,698 · 42rF SI11,451 · 35rH VS2790 · 34rI VS1781 · 34rD SI1744 · 35rI VVS2727 · 28rF IF676 · 40rE FL641 · 36rG SI1565 · 35rJ SI1520 · 23rJ VS2508 · 26rH VVS1418 · 36rJ VVS2268 · 28rG IF238 · 33rK SI1236 · 12rK VS2170 · 10rE SI2141 · 25rD SI2125 · 23rK SI2125 · 9rK VS1121 · 16rI VS2117 · 30rF SI2104 · 22rJ SI294 · 13rF FL90 · 28rI SI190 · 27rG SI281 · 21rI SI278 · 27rH SI167 · 26rH SI225 · 18rI VVS116 · 16r

Stones at this spec now

Current examples carried by more than one retailer, so the comparison is real. Prices shown in USD.

What this spec means

  • Round: the most common cut, with the highest light return per carat.
  • Lab-grown: chemically identical to natural diamonds, typically at least 90% less than a comparable natural cohort from 1 carat up.

Frequently asked

How much do retailers differ on the same diamond?

As of November 5, 2026, the same certified diamond typically costs 44% more at a typical retailer than at the cheapest for lab-grown stones, and 19% more for natural ones (the median across stones listed by two or more retailers). Comparing shows you the cheapest of the retailers listing the same stone.

Can I see retailers for one exact grade?

Yes. Each of the 52 color and clarity combinations above has its own page listing the retailers that stock exactly that grade.

Does Carat Hunter earn commission from these retailers?

No. We earn zero affiliate revenue from any retailer in our index.

How fresh is this data?

Listings refresh as we re-read each retailer, most of them every day. Static facts about each retailer refresh weekly.

How is the retailer ranking calculated?

Strictly by active inventory count for this exact spec. The retailer carrying the most stones at the spec ranks first. There is no editorial input, weighting or affiliate consideration.

Why do you not show per-retailer prices on this page?

Prices vary per stone, not per store. Click through to any matched diamond and you will see every retailer's price on the exact same physical stone, which is the meaningful comparison.