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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, 63 of them, across 202,866 current listings.

Updated November 6, 2026 · Independent. Zero affiliate revenue.

The market at this size and shape

Active listings

202,866

Retailers carrying

63

Median confirmed price

£477

Grade combinations

28

Certificate mix:IGI 194,585 · GCAL 982 · GIA 573 · HRD 2

What it actually costs

Half of these diamonds are listed between £403 and £827 (as of November 6, 2026).

Lower 10% £379Median £477Upper 10% £1,703

Middle half listed between £403 to £827

Certificated stones with a recently confirmed price only, 27,684 of them. Each contributes its cheapest confirmed price.

The same stone, priced differently

Cheapest to dearest, median

106%

Cheapest to dearest, median in price

£614

Stones compared

23,623

Across 23,623 stones of this size and shape carried by more than one retailer, the dearest listing sits 106% above the cheapest for the identical certificated diamond, a typical gap of £614. 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.

  3. 3Rare Carat14,341 in stock
    United States·Founded 2016·30-day returns·Ships to Ireland
    Terms read on the retailer’s own site, October 19, 2026
    Visit Rare Carat
  8. 8NZ Jewellers7,567 in stock
    New Zealand·Founded 2006·30-day returns·Ships to Ireland
    Terms read on the retailer’s own site, October 19, 2026
    Visit NZ Jewellers
  10. 10Adiamor6,925 in stock
    United States·Founded 1999·30-day returns
    Terms not yet verified
    Visit Adiamor
Show 15 more retailers
  1. 11

    The Perfect Carat

    6,340 in stock
    US
    Terms not yet verified
  4. 14B2C Jewels5,789 in stock
    United States·Founded 2004·30-day returns·Ships to Ireland
    Terms read on the retailer’s own site, October 19, 2026
    Visit B2C Jewels
  5. 15Aurelinne5,678 in stock
    United States·Founded 2021·30-day returns·Ships to Ireland
    Terms not yet verified
    Visit Aurelinne
  6. 16RockHer5,203 in stock
    United States·Founded 2016·40-day returns·Ships to Ireland
    Terms not yet verified
    Visit RockHer
  13. 23GemsNY3,318 in stock
    United States·Founded 1988·30-day returns·Ships to Ireland
    Terms not yet verified
    Visit GemsNY
  15. 25Cape Diamonds3,238 in stock
    South Africa·Founded 2005·7-day returns·Ships to Ireland
    Terms read on the retailer’s own site, June 15, 2026
    Visit Cape Diamonds

Stock counts reflect current listings. Founded and shipping details come from public sources. Return terms are our summary of each retailer's own policy page, dated per retailer above. Retailers change their terms, so check the retailer's own returns and shipping pages before you buy.

14 of the 25 retailers ship to Ireland. 11 do not.

Narrow it down by grade

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

E VVS245,983 · 57rE VS130,546 · 58rF VVS226,584 · 57rF VS119,552 · 53rD VVS214,890 · 57rD VVS19,630 · 54rE VVS19,123 · 55rD VS18,887 · 52rE VS27,506 · 45rG VVS27,347 · 44rG VS15,410 · 44rF VS25,370 · 44rF VVS12,856 · 53rD IF1,937 · 44rD FL1,815 · 34rD VS21,306 · 44rE IF813 · 39rG VS2809 · 30rH VVS2696 · 34rH VS1608 · 30rG VVS1571 · 40rF IF169 · 32rE FL153 · 33rH VS296 · 14rH VVS174 · 11rI VS169 · 18rG IF32 · 25rI VVS223 · 18r

Stones at this spec now

Current 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 at least 90% less than a comparable natural cohort from 1 carat up.

Frequently asked

How much do retailers differ on the same diamond?

Across 23,623 identical stones carried by more than one retailer, the typical gap between the cheapest and dearest listing is 106%, about £614.

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?

Listings refresh as we re-read each retailer, most of them every day. 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.