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Carat Hunter · Where to buy diamonds

Where to buy a 0.5ct lab-grown cushion diamond

Every retailer in our index stocking this size and shape, 39 of them, across 12,212 live listings.

Updated September 14, 2026 · Independent. Zero affiliate revenue.

The market at this size and shape

Active listings

12,212

Retailers carrying

39

Median active price

£221

Grade combinations

23

Certificate mix:IGI 11,297 · GIA 49 · GCAL 6

What it actually costs

Lower 10% £106Median £221Upper 10% £492

Middle half sell between £156 to £354

Certificated stones with a live price only, 2,770 of them. Each contributes its best available price.

The same stone, priced differently

Typical spread

160%

Typical difference

£278

Stones compared

1,631

Across 1,631 stones of this size and shape carried by more than one retailer, the dearest listing sits 160% above the cheapest for the identical certificated diamond, a typical gap of £278. 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 VVS23,895 · 37rD VS12,137 · 35rD VVS11,703 · 34rE VVS21,093 · 32rE VS1890 · 31rD VS2559 · 34rE VVS1516 · 33rF VVS2247 · 26rE VS2232 · 23rF VS1180 · 19rD IF173 · 27rG VVS2122 · 25rE IF108 · 26rF VS292 · 19rF VVS146 · 23rG VS143 · 15rG VS234 · 16rH VS224 · 12rF IF23 · 20rG VVS122 · 13rH VS121 · 7rH VVS210 · 6rI VS110 · 4r

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 1,631 identical stones carried by more than one retailer, the typical gap between the cheapest and dearest listing is 160%, about £278.

Can I see retailers for one exact grade?

Yes. Each of the 23 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 0.5ct Lab Grown Cushion Diamonds | Carat Hunter