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Carat Hunter · Where to buy diamonds

Where to buy a 3ct lab-grown round diamond

Every retailer in our index stocking this size and shape, 60 of them, across 290,738 live listings.

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

The market at this size and shape

Active listings

290,738

Retailers carrying

60

Median active price

£732

Grade combinations

32

Certificate mix:IGI 264,686 · GIA 16,753 · GCAL 2,988 · HRD 30 · AGS 4

What it actually costs

Lower 10% £401Median £732Upper 10% £3,247

Middle half sell between £575 to £1,322

Certificated stones with a live price only, 62,167 of them. Each contributes its best available price.

The same stone, priced differently

Typical spread

234%

Typical difference

£1,418

Stones compared

39,386

Across 39,386 stones of this size and shape carried by more than one retailer, the dearest listing sits 234% above the cheapest for the identical certificated diamond, a typical gap of £1,418. 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
  15. 25

    GemTrove

    2,285 in stock
    AU

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.

E VVS276,631 · 51rF VVS237,739 · 51rE VS135,716 · 50rF VS120,576 · 49rD VVS219,077 · 52rD VS116,677 · 49rD VVS114,148 · 46rD IF9,306 · 45rE VS28,370 · 45rG VVS27,741 · 41rE VVS17,464 · 50rG VS16,005 · 41rD VS25,607 · 45rD FL4,649 · 36rF VVS14,576 · 46rF VS24,441 · 42rH VS12,204 · 34rG VS21,772 · 36rH VVS21,612 · 35rE IF1,327 · 38rH VS21,218 · 27rG VVS1899 · 36rI VS2879 · 23rI VS1696 · 29rI VVS2406 · 25rF IF357 · 31rE FL234 · 26rH VVS1200 · 30rG IF143 · 28rF FL33 · 15rH IF19 · 13rI VVS113 · 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

  • Round: the most common cut, with the highest light return per 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 39,386 identical stones carried by more than one retailer, the typical gap between the cheapest and dearest listing is 234%, about £1,418.

Can I see retailers for one exact grade?

Yes. Each of the 32 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.