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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, 65 of them, across 79,380 live listings.

Updated September 16, 2026 · Independent. Zero affiliate revenue.

The market at this size and shape

Active listings

79,380

Retailers carrying

65

Median active price

£405

Grade combinations

29

Certificate mix:IGI 74,911 · GIA 2,073 · GCAL 791 · HRD 5

What it actually costs

Lower 10% £224Median £405Upper 10% £1,540

Middle half sell between £321 to £953

Certificated stones with a live price only, 19,349 of them. Each contributes its best available price.

The same stone, priced differently

Typical spread

190%

Typical difference

£678

Stones compared

11,237

Across 11,237 stones of this size and shape carried by more than one retailer, the dearest listing sits 190% above the cheapest for the identical certificated diamond, a typical gap of £678. 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.

Show 15 more retailers

Stock counts are updated daily. Founded, return window and shipping details are retailer-provided and were last verified September 2, 2026.

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

Narrow it down by grade

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

D VVS214,891 · 54rE VVS211,811 · 50rE VS19,784 · 52rD VS19,731 · 49rD VVS17,234 · 44rF VVS23,960 · 47rF VS13,821 · 48rE VVS13,217 · 43rD VS22,343 · 40rE VS22,298 · 42rG VS12,118 · 41rG VVS21,309 · 42rF VS21,249 · 41rD FL1,182 · 26rD IF1,097 · 38rG VS2737 · 35rF VVS1702 · 38rH VS1515 · 35rE IF377 · 37rH VVS2232 · 30rH VS2157 · 24rG VVS1148 · 27rE FL109 · 17rF IF103 · 22rI VS184 · 24rI VS254 · 17rG IF53 · 28rH VVS137 · 12rI VVS217 · 6r

Stones at this spec now

Live 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 60% to 80% less than a comparable natural cohort.

Frequently asked

How much do retailers differ on the same diamond?

Across 11,237 identical stones carried by more than one retailer, the typical gap between the cheapest and dearest listing is 190%, about £678.

Can I see retailers for one exact grade?

Yes. Each of the 29 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?

Live listings refresh daily. 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.

Where to Buy 1.5ct Lab Grown Cushion Diamonds | Carat Hunter