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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, 63 of them, across 161,727 current listings.

Updated October 29, 2026 · Independent. Zero affiliate revenue.

The market at this size and shape

Active listings

161,727

Retailers carrying

63

Median confirmed price

£700

Grade combinations

30

Certificate mix:IGI 150,595 · GIA 6,723 · GCAL 2,358 · HRD 9 · AGS 3

What it actually costs

Half of these diamonds are listed between £456 and £1,179 (as of October 29, 2026).

Lower 10% £393Median £700Upper 10% £2,239

Middle half listed between £456 to £1,179

Certificated stones with a recently confirmed price only, 20,505 of them. Each contributes its cheapest confirmed price.

The same stone, priced differently

Typical spread

289%

Typical difference

£1,906

Stones compared

16,258

Across 16,258 stones of this size and shape carried by more than one retailer, the dearest listing sits 289% above the cheapest for the identical certificated diamond, a typical gap of £1,906. 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 Carat11,360 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. 6Moon Ocean7,712 in stock
    United Kingdom·Founded 2022·30-day returns·Ships to United Kingdom
    Terms not yet verified
    Visit Moon Ocean
  7. 7Brilliance7,679 in stock
    United States·Founded 2002·30-day returns·Ships to United Kingdom
    Terms not yet verified
    Visit Brilliance
  8. 8Adiamor7,140 in stock
    United States·Founded 1999·30-day returns
    Terms not yet verified
    Visit Adiamor
  9. 9B2C Jewels6,959 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
  2. 12RockHer5,627 in stock
    United States·Founded 2016·40-day returns·Ships to United Kingdom
    Terms not yet verified
    Visit RockHer
  3. 13Cape Diamonds5,339 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
  6. 16Yorxs4,301 in stock
    Germany·Founded 2011·100-day returns
    Terms not yet verified
    Visit Yorxs
  12. 22GemsNY3,159 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.

16 of the 25 retailers ship to United Kingdom. 9 do not.

Narrow it down by grade

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

E VS124,149 · 62rE VVS223,689 · 59rD VVS215,084 · 56rD VVS112,917 · 52rF VVS212,795 · 56rD VS112,758 · 58rF VS112,213 · 57rD IF9,027 · 44rG VS16,631 · 50rE VS25,659 · 52rD FL5,351 · 40rE VVS14,254 · 50rG VVS24,000 · 49rF VS22,348 · 42rD VS22,090 · 49rH VS12,024 · 42rG VS21,750 · 45rF VVS11,258 · 46rE IF951 · 47rH VVS2936 · 34rH VS2605 · 32rI VS1345 · 28rF IF242 · 33rG VVS1233 · 39rE FL187 · 34rI VVS291 · 20rG IF51 · 25rI VS238 · 19rH VVS137 · 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 16,258 identical stones carried by more than one retailer, the typical gap between the cheapest and dearest listing is 289%, about £1,906.

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.