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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 80,595 live listings.

Updated September 18, 2026 · Independent. Zero affiliate revenue.

The market at this size and shape

Active listings

80,595

Retailers carrying

65

Median active price

£381

Grade combinations

29

Certificate mix:IGI 75,951 · GIA 2,055 · GCAL 789 · HRD 5

What it actually costs

Lower 10% £196Median £381Upper 10% £1,459

Middle half sell between £301 to £900

Certificated stones with a live price only, 19,502 of them. Each contributes its best available price.

The same stone, priced differently

Typical spread

188%

Typical difference

£643

Stones compared

11,456

Across 11,456 stones of this size and shape carried by more than one retailer, the dearest listing sits 188% above the cheapest for the identical certificated diamond, a typical gap of £643. 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.

Narrow it down by grade

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

D VVS215,051 · 54rE VVS212,143 · 50rE VS110,011 · 52rD VS19,830 · 49rD VVS17,345 · 44rF VVS23,994 · 47rF VS13,876 · 48rE VVS13,288 · 43rD VS22,357 · 40rE VS22,335 · 41rG VS12,151 · 41rG VVS21,322 · 42rF VS21,264 · 41rD FL1,192 · 26rD IF1,099 · 38rG VS2736 · 35rF VVS1716 · 38rH VS1511 · 35rE IF380 · 37rH VVS2231 · 30rH VS2155 · 24rG VVS1147 · 27rE FL110 · 17rF IF105 · 23rI VS183 · 24rG IF53 · 28rI VS246 · 17rH 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 11,456 identical stones carried by more than one retailer, the typical gap between the cheapest and dearest listing is 188%, about £643.

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