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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 293,914 live listings.

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

The market at this size and shape

Active listings

293,914

Retailers carrying

60

Median active price

£726

Grade combinations

32

Certificate mix:IGI 268,141 · GIA 16,804 · GCAL 2,996 · HRD 30 · AGS 4

What it actually costs

Lower 10% £401Median £726Upper 10% £3,225

Middle half sell between £574 to £1,292

Certificated stones with a live price only, 62,503 of them. Each contributes its best available price.

The same stone, priced differently

Typical spread

231%

Typical difference

£1,415

Stones compared

39,680

Across 39,680 stones of this size and shape carried by more than one retailer, the dearest listing sits 231% above the cheapest for the identical certificated diamond, a typical gap of £1,415. 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.

E VVS277,207 · 51rF VVS238,563 · 51rE VS136,049 · 50rF VS120,940 · 49rD VVS219,244 · 52rD VS116,873 · 48rD VVS114,262 · 46rD IF9,347 · 45rE VS28,337 · 45rG VVS27,856 · 41rE VVS17,513 · 50rG VS16,057 · 41rD VS25,759 · 45rD FL4,670 · 36rF VVS14,626 · 46rF VS24,479 · 42rH VS12,239 · 35rG VS21,787 · 36rH VVS21,655 · 37rE IF1,331 · 38rH VS21,215 · 28rG VVS1914 · 36rI VS2878 · 23rI VS1696 · 29rI VVS2408 · 25rF IF358 · 31rE FL236 · 26rH VVS1203 · 31rG IF144 · 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 39,680 identical stones carried by more than one retailer, the typical gap between the cheapest and dearest listing is 231%, about £1,415.

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.