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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 67,625 live listings.

Updated September 15, 2026 · Independent. Zero affiliate revenue.

The market at this size and shape

Active listings

67,625

Retailers carrying

58

Median active price

£1,006

Grade combinations

28

Certificate mix:IGI 64,968 · GCAL 594 · GIA 554 · HRD 2

What it actually costs

Lower 10% £529Median £1,006Upper 10% £3,361

Middle half sell between £673 to £1,766

Certificated stones with a live price only, 21,355 of them. Each contributes its best available price.

The same stone, priced differently

Typical spread

155%

Typical difference

£1,138

Stones compared

9,644

Across 9,644 stones of this size and shape carried by more than one retailer, the dearest listing sits 155% above the cheapest for the identical certificated diamond, a typical gap of £1,138. 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.

6 of the 25 retailers ship to United Kingdom. 19 do not.

Narrow it down by grade

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

F VVS211,729 · 45rG VVS28,181 · 34rF VS18,065 · 42rE VVS27,541 · 49rE VS17,258 · 49rG VS14,461 · 34rD VVS23,719 · 48rE VS23,266 · 35rD VS11,982 · 42rD VVS11,892 · 44rE VVS11,768 · 43rD FL1,422 · 26rF VS21,222 · 30rD IF1,000 · 36rH VVS2796 · 21rF VVS1684 · 40rD VS2604 · 30rH VS1572 · 20rE IF405 · 30rG VVS1404 · 23rG VS2251 · 22rH VVS1110 · 13rE FL104 · 23rH VS286 · 16rF IF66 · 22rI VVS213 · 9rG 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 9,644 identical stones carried by more than one retailer, the typical gap between the cheapest and dearest listing is 155%, about £1,138.

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.