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Carat Hunter · Where to buy diamonds

Where to buy a 1.5ct lab-grown cushion diamond

Every retailer in our index stocking this size and shape, 71 of them, across 110,577 current listings.

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

The market at this size and shape

Active listings

110,577

Retailers carrying

71

Median confirmed price

£306

Grade combinations

30

Certificate mix:IGI 105,615 · GIA 2,486 · GCAL 974 · HRD 4

What it actually costs

Half of these diamonds are listed between £220 and £437 (as of November 5, 2026).

Lower 10% £187Median £306Upper 10% £881

Middle half listed between £220 to £437

Certificated stones with a recently confirmed price only, 11,612 of them. Each contributes its cheapest confirmed price.

The same stone, priced differently

Typical spread

362%

Typical difference

£933

Stones compared

9,683

Across 9,683 stones of this size and shape carried by more than one retailer, the dearest listing sits 362% above the cheapest for the identical certificated diamond, a typical gap of £933. 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.

  4. 4Rare Carat6,231 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
  5. 5B2C Jewels5,923 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
  7. 7Adiamor5,521 in stock
    United States·Founded 1999·30-day returns
    Terms not yet verified
    Visit Adiamor
Show 15 more retailers
  1. 11Yorxs4,146 in stock
    Germany·Founded 2011·100-day returns
    Terms not yet verified
    Visit Yorxs
  4. 14Cape Diamonds3,583 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
  9. 19RockHer2,387 in stock
    United States·Founded 2016·40-day returns·Ships to Ireland
    Terms not yet verified
    Visit RockHer

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 Ireland. 10 do not.

Narrow it down by grade

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

D VVS220,833 · 59rE VVS215,934 · 60rE VS114,106 · 60rD VS112,790 · 54rD VVS111,849 · 55rE VVS15,122 · 56rF VS14,992 · 56rF VVS24,786 · 52rD VS23,023 · 50rE VS22,866 · 52rG VS12,497 · 50rD IF2,224 · 45rD FL2,030 · 39rG VVS21,625 · 46rF VS21,452 · 49rF VVS11,114 · 46rG VS2807 · 39rE IF641 · 45rH VS1580 · 39rE FL273 · 27rH VVS2258 · 35rG VVS1180 · 34rH VS2177 · 30rF IF128 · 28rG IF81 · 36rI VS165 · 24rI VS248 · 24rH VVS146 · 18rF FL27 · 19rI VVS223 · 8r

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 9,683 identical stones carried by more than one retailer, the typical gap between the cheapest and dearest listing is 362%, about £933.

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.