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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, 67 of them, across 472,384 current listings.

Updated November 2, 2026 · Independent. Zero affiliate revenue.

The market at this size and shape

Active listings

472,384

Retailers carrying

67

Median confirmed price

£586

Grade combinations

31

Certificate mix:IGI 430,585 · GIA 25,492 · GCAL 4,894 · HRD 27 · AGS 4

What it actually costs

Half of these diamonds are listed between £405 and £968 (as of November 2, 2026).

Lower 10% £338Median £586Upper 10% £1,983

Middle half listed between £405 to £968

Certificated stones with a recently confirmed price only, 39,756 of them. Each contributes its cheapest confirmed price.

The same stone, priced differently

Typical spread

356%

Typical difference

£1,794

Stones compared

30,893

Across 30,893 stones of this size and shape carried by more than one retailer, the dearest listing sits 356% above the cheapest for the identical certificated diamond, a typical gap of £1,794. 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 Jewellers29,676 in stock
    New Zealand·Founded 2006·30-day returns·Ships to United Kingdom
    Terms read on the retailer’s own site, October 19, 2026
    Visit NZ Jewellers
  3. 3

    The Perfect Carat

    24,177 in stock
    US
    Terms not yet verified
  4. 4Aurelinne24,002 in stock
    United States·Founded 2021·30-day returns·Ships to United Kingdom
    Terms not yet verified
    Visit Aurelinne
  8. 8B2C Jewels17,995 in stock
    United States·Founded 2004·30-day returns·Ships to United Kingdom
    Terms read on the retailer’s own site, October 19, 2026
    Visit B2C Jewels
  9. 9Brilliance17,749 in stock
    United States·Founded 2002·30-day returns·Ships to United Kingdom
    Terms not yet verified
    Visit Brilliance
Show 15 more retailers
  2. 12Adiamor15,884 in stock
    United States·Founded 1999·30-day returns
    Terms not yet verified
    Visit Adiamor
  3. 13Rare Carat14,768 in stock
    United States·Founded 2016·30-day returns·Ships to United Kingdom
    Terms read on the retailer’s own site, October 19, 2026
    Visit Rare Carat
  4. 14RockHer14,122 in stock
    United States·Founded 2016·40-day returns·Ships to United Kingdom
    Terms not yet verified
    Visit RockHer
  7. 17Moon Ocean13,079 in stock
    United Kingdom·Founded 2022·30-day returns·Ships to United Kingdom
    Terms not yet verified
    Visit Moon Ocean
  8. 18Yorxs11,115 in stock
    Germany·Founded 2011·100-day returns
    Terms not yet verified
    Visit Yorxs
  10. 20Cape Diamonds9,976 in stock
    South Africa·Founded 2005·7-day returns·Ships to United Kingdom
    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.

18 of the 25 retailers ship to United Kingdom. 7 do not.

Narrow it down by grade

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

E VVS2114,080 · 60rF VVS265,295 · 57rE VS160,609 · 59rD VVS236,262 · 55rF VS136,187 · 51rD VS128,075 · 59rD VVS119,261 · 54rE VVS114,498 · 56rG VVS213,620 · 52rE VS213,611 · 50rD IF11,448 · 51rG VS19,769 · 48rF VVS19,218 · 57rF VS28,909 · 49rD FL8,061 · 43rD VS27,991 · 47rH VVS22,532 · 45rG VS22,505 · 44rE IF2,439 · 43rG VVS11,889 · 44rH VS11,740 · 43rH VS2764 · 34rI VS1752 · 33rI VVS2702 · 28rF IF668 · 38rE FL628 · 37rH VVS1417 · 36rG IF237 · 33rI VS2115 · 30rF FL80 · 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 30,893 identical stones carried by more than one retailer, the typical gap between the cheapest and dearest listing is 356%, about £1,794.

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.