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Carat Hunter · Where to buy diamonds

Where to buy a 3ct lab-grown cushion diamond

Every retailer in our index stocking this size and shape, 64 of them, across 161,736 current listings.

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

The market at this size and shape

Active listings

161,736

Retailers carrying

64

Median confirmed price

£666

Grade combinations

30

Certificate mix:IGI 150,450 · GIA 6,614 · GCAL 2,365 · HRD 9 · AGS 3

What it actually costs

Half of these diamonds are listed between £447 and £1,125 (as of November 5, 2026).

Lower 10% £386Median £666Upper 10% £2,044

Middle half listed between £447 to £1,125

Certificated stones with a recently confirmed price only, 20,988 of them. Each contributes its cheapest confirmed price.

The same stone, priced differently

Cheapest to dearest, median

303%

Cheapest to dearest, median in price

£1,898

Stones compared

17,205

Across 17,205 stones of this size and shape carried by more than one retailer, the dearest listing sits 303% above the cheapest for the identical certificated diamond, a typical gap of £1,898. 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.

  1. 1Rare Carat11,269 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
  6. 6Brilliance8,340 in stock
    United States·Founded 2002·30-day returns·Ships to United Kingdom
    Terms not yet verified
    Visit Brilliance
  7. 7Adiamor7,510 in stock
    United States·Founded 1999·30-day returns
    Terms not yet verified
    Visit Adiamor
  8. 8B2C Jewels6,705 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
Show 15 more retailers
  1. 11RockHer5,693 in stock
    United States·Founded 2016·40-day returns·Ships to United Kingdom
    Terms not yet verified
    Visit RockHer
  3. 13Moon Ocean4,545 in stock
    United Kingdom·Founded 2022·30-day returns·Ships to United Kingdom
    Terms not yet verified
    Visit Moon Ocean
  4. 14Cape Diamonds4,512 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
  5. 15Yorxs4,471 in stock
    Germany·Founded 2011·100-day returns
    Terms not yet verified
    Visit Yorxs
  9. 19GemsNY3,582 in stock
    United States·Founded 1988·30-day returns·Ships to United Kingdom
    Terms not yet verified
    Visit GemsNY

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.

15 of the 25 retailers ship to United Kingdom. 10 do not.

Narrow it down by grade

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

E VVS223,775 · 60rE VS123,171 · 62rD VVS215,058 · 57rF VVS213,157 · 58rD VS113,130 · 58rD VVS112,816 · 53rF VS112,408 · 58rD IF9,136 · 45rG VS16,572 · 50rD FL5,598 · 40rE VS25,501 · 52rE VVS14,255 · 54rG VVS23,921 · 50rF VS22,340 · 42rD VS22,093 · 50rH VS11,961 · 40rG VS21,777 · 45rF VVS11,387 · 48rE IF960 · 47rH VVS2884 · 34rH VS2602 · 32rI VS1355 · 28rF IF246 · 32rG VVS1222 · 38rE FL185 · 34rI VVS288 · 20rG IF52 · 25rI VS236 · 19rH VVS136 · 15rF FL14 · 13r

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

  • Cushion: a softened-corner square or rectangle with a vintage feel.
  • 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 17,205 identical stones carried by more than one retailer, the typical gap between the cheapest and dearest listing is 303%, about £1,898.

Can I see retailers for one exact grade?

Yes. Each of the 30 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.