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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, 62 of them, across 193,095 current listings.

Updated November 2, 2026 · Independent. Zero affiliate revenue.

The market at this size and shape

Active listings

193,095

Retailers carrying

62

Median confirmed price

€574

Grade combinations

28

Certificate mix:IGI 185,368 · GCAL 981 · GIA 574 · HRD 2

What it actually costs

Half of these diamonds are listed between €484 and €1,013 (as of November 2, 2026).

Lower 10% €456Median €574Upper 10% €2,196

Middle half listed between €484 to €1,013

Certificated stones with a recently confirmed price only, 27,357 of them. Each contributes its cheapest confirmed price.

The same stone, priced differently

Typical spread

166%

Typical difference

€1,404

Stones compared

23,154

Across 23,154 stones of this size and shape carried by more than one retailer, the dearest listing sits 166% above the cheapest for the identical certificated diamond, a typical gap of €1,404. 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 Carat14,344 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
  7. 7Brilliance7,059 in stock
    United States·Founded 2002·30-day returns·Ships to European Union
    Terms not yet verified
    Visit Brilliance
  9. 9NZ Jewellers6,777 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
  10. 10Adiamor6,445 in stock
    United States·Founded 1999·30-day returns
    Terms not yet verified
    Visit Adiamor
Show 15 more retailers
  1. 11B2C Jewels6,159 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
  4. 14

    The Perfect Carat

    5,882 in stock
    US
    Terms not yet verified
  5. 15Aurelinne5,135 in stock
    United States·Founded 2021·30-day returns·Ships to European Union
    Terms not yet verified
    Visit Aurelinne
  7. 17Moon Ocean4,462 in stock
    United Kingdom·Founded 2022·30-day returns·Ships to European Union
    Terms not yet verified
    Visit Moon Ocean
  8. 18RockHer4,427 in stock
    United States·Founded 2016·40-day returns·Ships to European Union
    Terms not yet verified
    Visit RockHer
  14. 24GemsNY3,091 in stock
    United States·Founded 1988·30-day returns·Ships to European Union
    Terms not yet verified
    Visit GemsNY
  15. 25Yorxs2,795 in stock
    Germany·Founded 2011·100-day returns·Ships to European Union
    Terms not yet verified
    Visit Yorxs

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 VVS242,754 · 56rE VS129,093 · 57rF VVS225,133 · 55rF VS118,936 · 52rD VVS213,939 · 55rD VVS19,388 · 53rE VVS18,679 · 55rD VS18,257 · 50rE VS27,342 · 43rG VVS27,168 · 44rF VS25,363 · 44rG VS15,304 · 43rF VVS12,751 · 52rD IF1,851 · 44rD FL1,775 · 33rD VS21,253 · 43rG VS2828 · 30rE IF797 · 39rH VVS2688 · 34rH VS1635 · 31rG VVS1557 · 39rF IF164 · 30rE FL141 · 29rH VS297 · 14rI VS169 · 19rH VVS164 · 6rG IF32 · 25rI 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 23,154 identical stones carried by more than one retailer, the typical gap between the cheapest and dearest listing is 166%, about €1,404.

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.