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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 187,976 current listings.

Updated November 1, 2026 · Independent. Zero affiliate revenue.

The market at this size and shape

Active listings

187,976

Retailers carrying

63

Median confirmed price

€579

Grade combinations

28

Certificate mix:IGI 180,440 · GCAL 983 · GIA 580 · HRD 2

What it actually costs

Half of these diamonds are listed between €489 and €1,024 (as of November 1, 2026).

Lower 10% €459Median €579Upper 10% €2,198

Middle half listed between €489 to €1,024

Certificated stones with a recently confirmed price only, 27,272 of them. Each contributes its cheapest confirmed price.

The same stone, priced differently

Typical spread

165%

Typical difference

€1,390

Stones compared

22,892

Across 22,892 stones of this size and shape carried by more than one retailer, the dearest listing sits 165% above the cheapest for the identical certificated diamond, a typical gap of €1,390. 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 Carat14,582 in stock
    United States·Founded 2016·30-day returns·Ships to European Union
    Terms read on the retailer’s own site, October 19, 2026
    Visit Rare Carat
  5. 5Brilliance7,069 in stock
    United States·Founded 2002·30-day returns·Ships to European Union
    Terms not yet verified
    Visit Brilliance
  8. 8Adiamor6,318 in stock
    United States·Founded 1999·30-day returns
    Terms not yet verified
    Visit Adiamor
Show 15 more retailers
  1. 11B2C Jewels6,048 in stock
    United States·Founded 2004·30-day returns·Ships to European Union
    Terms read on the retailer’s own site, October 19, 2026
    Visit B2C Jewels
  2. 12NZ Jewellers5,827 in stock
    New Zealand·Founded 2006·30-day returns·Ships to European Union
    Terms read on the retailer’s own site, October 19, 2026
    Visit NZ Jewellers
  5. 15Moon Ocean4,753 in stock
    United Kingdom·Founded 2022·30-day returns·Ships to European Union
    Terms not yet verified
    Visit Moon Ocean
  6. 16Aurelinne4,622 in stock
    United States·Founded 2021·30-day returns·Ships to European Union
    Terms not yet verified
    Visit Aurelinne
  7. 17

    The Perfect Carat

    4,604 in stock
    US
    Terms not yet verified
  8. 18RockHer4,318 in stock
    United States·Founded 2016·40-day returns·Ships to European Union
    Terms not yet verified
    Visit RockHer
  11. 21Cape Diamonds3,514 in stock
    South Africa·Founded 2005·7-day returns·Ships to European Union
    Terms read on the retailer’s own site, June 15, 2026
    Visit Cape Diamonds
  14. 24GemsNY3,091 in stock
    United States·Founded 1988·30-day returns·Ships to European Union
    Terms not yet verified
    Visit GemsNY

Stock counts are updated daily. 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 European Union. 11 do not.

Narrow it down by grade

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

E VVS240,659 · 56rE VS127,963 · 58rF VVS224,552 · 55rF VS118,651 · 52rD VVS213,600 · 55rD VVS19,305 · 53rE VVS18,499 · 55rD VS18,053 · 50rE VS27,264 · 43rG VVS27,074 · 43rF VS25,405 · 44rG VS15,284 · 43rF VVS12,685 · 52rD IF1,848 · 44rD FL1,771 · 33rD VS21,246 · 43rG VS2848 · 29rE IF783 · 39rH VVS2684 · 34rH VS1644 · 31rG VVS1553 · 39rF IF163 · 30rE FL141 · 29rH VS297 · 14rI VS170 · 20rH VVS164 · 6rG IF33 · 26rI VVS227 · 22r

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 22,892 identical stones carried by more than one retailer, the typical gap between the cheapest and dearest listing is 165%, about €1,390.

Can I see retailers for one exact grade?

Yes. Each of the 28 color 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.