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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 181,825 current listings.

Updated October 30, 2026 · Independent. Zero affiliate revenue.

The market at this size and shape

Active listings

181,825

Retailers carrying

63

Median confirmed price

CA$907

Grade combinations

28

Certificate mix:IGI 174,480 · GCAL 986 · GIA 586 · HRD 2

What it actually costs

Half of these diamonds are listed between CA$761 and CA$1,606 (as of October 30, 2026).

Lower 10% CA$717Median CA$907Upper 10% CA$3,381

Middle half listed between CA$761 to CA$1,606

Certificated stones with a recently confirmed price only, 27,322 of them. Each contributes its cheapest confirmed price.

The same stone, priced differently

Typical spread

146%

Typical difference

CA$2,047

Stones compared

22,707

Across 22,707 stones of this size and shape carried by more than one retailer, the dearest listing sits 146% above the cheapest for the identical certificated diamond, a typical gap of CA$2,047. 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 Canada
    Terms read on the retailer’s own site, October 19, 2026
    Visit Rare Carat
  9. 9Adiamor6,009 in stock
    United States·Founded 1999·30-day returns·Ships to Canada
    Terms not yet verified
    Visit Adiamor
  10. 10NZ Jewellers5,827 in stock
    New Zealand·Founded 2006·30-day returns·Ships to Canada
    Terms read on the retailer’s own site, October 19, 2026
    Visit NZ Jewellers
Show 15 more retailers
  3. 13B2C Jewels5,517 in stock
    United States·Founded 2004·30-day returns·Ships to Canada
    Terms read on the retailer’s own site, October 19, 2026
    Visit B2C Jewels
  5. 15Aurelinne4,622 in stock
    United States·Founded 2021·30-day returns·Ships to Canada
    Terms not yet verified
    Visit Aurelinne
  6. 16

    The Perfect Carat

    4,604 in stock
    US
    Terms not yet verified
  8. 18RockHer3,995 in stock
    United States·Founded 2016·40-day returns·Ships to Canada
    Terms not yet verified
    Visit RockHer
  10. 20Cape Diamonds3,514 in stock
    South Africa·Founded 2005·7-day returns·Ships to Canada
    Terms read on the retailer’s own site, June 15, 2026
    Visit Cape Diamonds
  12. 22GemsNY3,087 in stock
    United States·Founded 1988·30-day returns·Ships to Canada
    Terms not yet verified
    Visit GemsNY
  13. 23Yorxs2,835 in stock
    Germany·Founded 2011·100-day returns
    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.

18 of the 25 retailers ship to Canada. 7 do not.

Narrow it down by grade

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

E VVS237,773 · 56rE VS126,794 · 58rF VVS224,074 · 55rF VS118,315 · 52rD VVS212,909 · 55rD VVS19,054 · 52rE VVS18,088 · 54rD VS17,664 · 50rG VVS27,502 · 42rE VS27,183 · 42rF VS25,507 · 44rG VS15,402 · 43rF VVS12,575 · 52rD IF1,848 · 44rD FL1,771 · 33rD VS21,227 · 43rG VS2858 · 30rE IF758 · 39rH VVS2710 · 33rH VS1656 · 31rG VVS1555 · 39rF IF159 · 30rE FL140 · 29rH VS297 · 14rH VVS168 · 7rI VS168 · 20rG IF33 · 26rI VVS228 · 23r

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 22,707 identical stones carried by more than one retailer, the typical gap between the cheapest and dearest listing is 146%, about CA$2,047.

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.