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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 469,824 current listings.

Updated October 30, 2026 · Independent. Zero affiliate revenue.

The market at this size and shape

Active listings

469,824

Retailers carrying

67

Median confirmed price

£583

Grade combinations

31

Certificate mix:IGI 429,459 · GIA 25,573 · GCAL 4,836 · HRD 27 · AGS 5

What it actually costs

Half of these diamonds are listed between £406 and £946 (as of October 30, 2026).

Lower 10% £344Median £583Upper 10% £1,967

Middle half listed between £406 to £946

Certificated stones with a recently confirmed price only, 39,516 of them. Each contributes its cheapest confirmed price.

The same stone, priced differently

Typical spread

356%

Typical difference

£1,783

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 £1,783. 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 Jewellers28,472 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. 3Aurelinne25,348 in stock
    United States·Founded 2021·30-day returns·Ships to United Kingdom
    Terms not yet verified
    Visit Aurelinne
  5. 5

    The Perfect Carat

    22,535 in stock
    US
    Terms not yet verified
  7. 7Moon Ocean18,652 in stock
    United Kingdom·Founded 2022·30-day returns·Ships to United Kingdom
    Terms not yet verified
    Visit Moon Ocean
  8. 8B2C Jewels17,774 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
  10. 10Brilliance17,375 in stock
    United States·Founded 2002·30-day returns·Ships to United Kingdom
    Terms not yet verified
    Visit Brilliance
Show 15 more retailers
  3. 13Adiamor15,639 in stock
    United States·Founded 1999·30-day returns
    Terms not yet verified
    Visit Adiamor
  4. 14Rare Carat14,644 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
  5. 15RockHer14,346 in stock
    United States·Founded 2016·40-day returns·Ships to United Kingdom
    Terms not yet verified
    Visit RockHer
  8. 18Cape Diamonds11,297 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
  9. 19Yorxs11,208 in stock
    Germany·Founded 2011·100-day returns
    Terms not yet verified
    Visit Yorxs

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.

17 of the 25 retailers ship to United Kingdom. 8 do not.

Narrow it down by grade

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

E VVS2115,275 · 60rF VVS264,717 · 57rE VS160,578 · 59rF VS136,001 · 51rD VVS234,705 · 55rD VS127,598 · 58rD VVS119,646 · 54rE VVS114,483 · 56rE VS213,393 · 51rG VVS213,344 · 52rD IF11,489 · 51rG VS19,666 · 48rF VVS18,971 · 57rF VS28,528 · 48rD VS28,056 · 47rD FL7,876 · 43rH VVS22,552 · 45rG VS22,428 · 44rE IF2,387 · 43rG VVS11,844 · 44rH VS11,834 · 43rI VS1823 · 33rH VS2760 · 33rI VVS2757 · 28rF IF647 · 38rE FL619 · 37rH VVS1394 · 36rG IF236 · 33rI VS2114 · 30rF FL80 · 27rI VVS115 · 15r

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 £1,783.

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.