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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 473,115 current listings.

Updated November 5, 2026 · Independent. Zero affiliate revenue.

The market at this size and shape

Active listings

473,115

Retailers carrying

68

Median confirmed price

£579

Grade combinations

31

Certificate mix:IGI 431,088 · GIA 25,521 · GCAL 4,863 · HRD 27 · AGS 2

What it actually costs

Half of these diamonds are listed between £407 and £991 (as of November 5, 2026).

Lower 10% £343Median £579Upper 10% £1,928

Middle half listed between £407 to £991

Certificated stones with a recently confirmed price only, 39,651 of them. Each contributes its cheapest confirmed price.

The same stone, priced differently

Cheapest to dearest, median

355%

Cheapest to dearest, median in price

£1,718

Stones compared

31,129

Across 31,129 stones of this size and shape carried by more than one retailer, the dearest listing sits 355% above the cheapest for the identical certificated diamond, a typical gap of £1,718. That gap is what comparing before you buy avoids.

Every retailer that stocks this spec

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

  2. 2NZ Jewellers29,685 in stock
    New Zealand·Founded 2006·30-day returns·Ships to Ireland
    Terms read on the retailer’s own site, October 19, 2026
    Visit NZ Jewellers
  3. 3

    The Perfect Carat

    26,512 in stock
    US
    Terms not yet verified
  4. 4Aurelinne24,234 in stock
    United States·Founded 2021·30-day returns·Ships to Ireland
    Terms not yet verified
    Visit Aurelinne
  9. 9B2C Jewels17,111 in stock
    United States·Founded 2004·30-day returns·Ships to Ireland
    Terms read on the retailer’s own site, October 19, 2026
    Visit B2C Jewels
  10. 10Adiamor16,465 in stock
    United States·Founded 1999·30-day returns
    Terms not yet verified
    Visit Adiamor
Show 15 more retailers
  2. 12Rare Carat15,838 in stock
    United States·Founded 2016·30-day returns·Ships to Ireland
    Terms read on the retailer’s own site, October 19, 2026
    Visit Rare Carat
  4. 14RockHer14,115 in stock
    United States·Founded 2016·40-day returns·Ships to Ireland
    Terms not yet verified
    Visit RockHer
  9. 19Yorxs10,803 in stock
    Germany·Founded 2011·100-day returns
    Terms not yet verified
    Visit Yorxs
  10. 20Cape Diamonds10,337 in stock
    South Africa·Founded 2005·7-day returns·Ships to Ireland
    Terms read on the retailer’s own site, June 15, 2026
    Visit Cape Diamonds

Stock counts are updated daily. 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.

16 of the 25 retailers ship to Ireland. 9 do not.

Narrow it down by grade

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

E VVS2113,770 · 62rF VVS266,721 · 58rE VS160,254 · 60rF VS137,124 · 52rD VVS235,930 · 57rD VS127,658 · 61rD VVS118,912 · 56rE VVS114,513 · 55rG VVS213,685 · 52rE VS213,498 · 50rD IF11,521 · 52rG VS19,931 · 48rF VVS19,290 · 57rF VS28,882 · 49rD FL8,341 · 43rD VS27,591 · 47rG VS22,523 · 44rH VVS22,486 · 45rE IF2,418 · 45rG VVS11,903 · 44rH VS11,698 · 43rH VS2784 · 34rI VS1784 · 34rI VVS2726 · 28rF IF667 · 39rE FL629 · 37rH VVS1416 · 36rG IF238 · 33rI VS2117 · 30rF FL84 · 27rI 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?

Across 31,129 identical stones carried by more than one retailer, the typical gap between the cheapest and dearest listing is 355%, about £1,718.

Can I see retailers for one exact grade?

Yes. Each of the 31 colour 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.