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Carat Hunter · Where to buy diamonds

Where to buy a 0.5ct lab-grown marquise diamond

Every retailer in our index stocking this size and shape, 47 of them, across 25,407 live listings.

Updated September 17, 2026 · Independent. Zero affiliate revenue.

The market at this size and shape

Active listings

25,407

Retailers carrying

47

Median active price

£216

Grade combinations

26

Certificate mix:IGI 23,964 · GIA 161 · GCAL 128

What it actually costs

Lower 10% £126Median £216Upper 10% £454

Middle half sell between £143 to £349

Certificated stones with a live price only, 6,193 of them. Each contributes its best available price.

The same stone, priced differently

Typical spread

151%

Typical difference

£252

Stones compared

2,988

Across 2,988 stones of this size and shape carried by more than one retailer, the dearest listing sits 151% above the cheapest for the identical certificated diamond, a typical gap of £252. 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.

8 of the 25 retailers ship to United Kingdom. 17 do not.

Narrow it down by grade

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

D VVS27,511 · 44rD VVS16,738 · 35rD VS12,767 · 40rE VVS21,382 · 33rE VVS11,381 · 33rE VS11,175 · 36rD IF875 · 32rF VVS2464 · 31rD VS2446 · 33rF VS1389 · 26rG VS1322 · 24rF VS2260 · 22rE VS2235 · 25rE IF217 · 32rH VS1203 · 20rD FL195 · 21rG VVS2184 · 20rH VS2163 · 15rF VVS1141 · 26rG VS298 · 16rH VVS284 · 20rI VS142 · 11rE FL41 · 18rI VS232 · 12rI VVS219 · 10rG VVS115 · 12r

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

  • Marquise: a pointed-end ellipse that faces up large for its carat.
  • 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 2,988 identical stones carried by more than one retailer, the typical gap between the cheapest and dearest listing is 151%, about £252.

Can I see retailers for one exact grade?

Yes. Each of the 26 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 Marquise Diamonds | Carat Hunter