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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 205,069 current listings.

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

The market at this size and shape

Active listings

205,069

Retailers carrying

63

Median confirmed price

CA$897

Grade combinations

36

Certificate mix:IGI 196,710 · GCAL 977 · GIA 581 · HRD 2

What it actually costs

Half of these diamonds are listed between CA$758 and CA$1,554 (as of November 6, 2026).

Lower 10% CA$712Median CA$897Upper 10% CA$3,201

Middle half listed between CA$758 to CA$1,554

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

The same stone, priced differently

As of November 6, 2026, the same certified diamond typically costs 44% more at a typical retailer than at the cheapest for lab-grown stones, and 20% more for natural ones (the median across stones listed by two or more retailers). Comparing shows you the cheapest of the retailers listing the same stone.

Every retailer that stocks this spec

Ranked by active inventory count. Selection is mechanical, not editorial.

  3. 3Rare Carat14,401 in stock
    United States·Founded 2016·GCAL, GIA, IGI·30-day returns·Ships to Canada
    Terms read on the retailer’s own site, October 19, 2026
    Visit Rare Carat
  8. 8NZ Jewellers7,592 in stock
    New Zealand·Founded 2006·GCAL, GIA, IGI·30-day returns·Ships to Canada
    Terms read on the retailer’s own site, October 19, 2026
    Visit NZ Jewellers
  10. 10Adiamor6,951 in stock
    United States·Founded 1999·GCAL, GIA, IGI·Ships to Canada
    Terms not yet verified
    Visit Adiamor
Show 53 more retailers
  2. 12

    The Perfect Carat

    6,362 in stock
    US·GCAL, GIA, IGI
    Terms not yet verified
  4. 14B2C Jewels5,821 in stock
    United States·Founded 2004·GIA, IGI·30-day returns·Ships to Canada
    Terms read on the retailer’s own site, October 19, 2026
    Visit B2C Jewels
  5. 15Aurelinne5,698 in stock
    United States·Founded 2021·GCAL, GIA, IGI·Ships to Canada
    Terms not yet verified
    Visit Aurelinne
  6. 16RockHer5,215 in stock
    United States·Founded 2016·GIA, IGI·Ships to Canada
    Terms not yet verified
    Visit RockHer
  13. 23GemsNY3,318 in stock
    United States·Founded 1988·GCAL, GIA, IGI·Ships to Canada
    Terms not yet verified
    Visit GemsNY
  15. 25Cape Diamonds3,238 in stock
    South Africa·Founded 2005·GIA, IGI·7-day returns·Ships to Canada
    Terms read on the retailer’s own site, June 15, 2026
    Visit Cape Diamonds
  18. 28Yorxs2,723 in stock
    Germany·Founded 2011·GIA, IGI
    Terms not yet verified
    Visit Yorxs
  34. 44

    GemTrove

    231 in stock
    AU·IGI
    Terms not yet verified
  35. 45Allurez214 in stock
    United States·Founded 2010·GIA, IGI·Ships to Canada
    Terms not yet verified
    Visit Allurez
  38. 48Jared89 in stock
    United States·Founded 1993·GIA, IGI
    Terms not yet verified
    Visit Jared
  39. 49Zales82 in stock
    United States·Founded 1924·GCAL, GIA, IGI
    Terms not yet verified
    Visit Zales
  41. 51ZCOVA59 in stock
    Malaysia·Founded 2015·IGI·Ships to Canada
    Terms not yet verified
    Visit ZCOVA
  44. 5425karats36 in stock
    United States·Founded 2008·IGI·60-day returns·Ships to Canada
    Terms read on the retailer’s own site, June 15, 2026
    Visit 25karats
  48. 58

    Lauren B

    5 in stock
    US
    Terms not yet verified
  49. 59

    Whiteflash

    5 in stock
    US·GIA, IGI
    Terms not yet verified
  50. 60

    Diamovida

    4 in stock
    CA·IGI·Ships to Canada
    Terms not yet verified
  52. 62

    Diamond Culture

    1 in stock
    HK·IGI
    Terms not yet verified

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.

36 of the 57 retailers with shipping details ship to Canada. 21 do not. 6 retailers have not published any shipping details.

Narrow it down by grade

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

E VVS246,523 · 57rE VS130,794 · 58rF VVS226,721 · 57rF VS119,672 · 53rD VVS215,007 · 57rD VVS19,672 · 54rE VVS19,164 · 55rD VS18,982 · 52rE VS27,545 · 45rG VVS27,361 · 44rG VS15,419 · 44rF VS25,382 · 44rF VVS12,868 · 53rD IF1,939 · 44rD FL1,817 · 34rD VS21,310 · 44rE IF817 · 39rG VS2815 · 31rH VVS2696 · 34rH VS1608 · 30rG VVS1571 · 40rE SI1293 · 25rF SI1249 · 31rF IF169 · 32rE FL153 · 33rH VS296 · 14rD SI183 · 22rH VVS174 · 11rI VS169 · 18rG SI145 · 7rJ VVS235 · 19rG IF32 · 25rI VVS223 · 18rE SI218 · 16rG SI218 · 17rJ VS111 · 9r

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?

As of November 6, 2026, the same certified diamond typically costs 44% more at a typical retailer than at the cheapest for lab-grown stones, and 20% more for natural ones (the median across stones listed by two or more retailers). Comparing shows you the cheapest of the retailers listing the same stone.

Can I see retailers for one exact grade?

Yes. Each of the 36 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.