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Carat Hunter · Where to buy diamonds

Where to buy a 3ct lab-grown marquise diamond

Every retailer in our index stocking this size and shape, 58 of them, across 78,612 live listings.

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

The market at this size and shape

Active listings

78,612

Retailers carrying

58

Median active price

£969

Grade combinations

28

Certificate mix:IGI 75,499 · GCAL 651 · GIA 571 · HRD 2

What it actually costs

Lower 10% £540Median £969Upper 10% £3,538

Middle half sell between £664 to £1,812

Certificated stones with a live price only, 22,806 of them. Each contributes its best available price.

The same stone, priced differently

Typical spread

157%

Typical difference

£1,146

Stones compared

11,410

Across 11,410 stones of this size and shape carried by more than one retailer, the dearest listing sits 157% above the cheapest for the identical certificated diamond, a typical gap of £1,146. 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.

F VVS213,614 · 44rE VS19,878 · 49rE VVS29,829 · 48rF VS19,518 · 43rG VVS28,534 · 35rG VS14,508 · 34rD VVS24,060 · 49rE VS23,903 · 36rD VS12,330 · 42rD VVS12,079 · 45rE VVS11,901 · 43rF VS21,672 · 31rD FL1,422 · 26rD IF1,028 · 36rH VVS2852 · 21rF VVS1735 · 40rD VS2640 · 31rH VS1577 · 19rG VVS1432 · 23rE IF412 · 30rG VS2279 · 22rH VVS1111 · 14rE FL105 · 23rH VS289 · 16rF IF66 · 22rI VVS213 · 10rG IF12 · 11rI VS111 · 8r

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 11,410 identical stones carried by more than one retailer, the typical gap between the cheapest and dearest listing is 157%, about £1,146.

Can I see retailers for one exact grade?

Yes. Each of the 28 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.