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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 199,372 current listings.

Updated November 4, 2026 · Independent. Zero affiliate revenue.

The market at this size and shape

Active listings

199,372

Retailers carrying

62

Median confirmed price

CA$897

Grade combinations

28

Certificate mix:IGI 191,235 · GCAL 954 · GIA 572 · HRD 2

What it actually costs

Half of these diamonds are listed between CA$755 and CA$1,562 (as of November 4, 2026).

Lower 10% CA$711Median CA$897Upper 10% CA$3,276

Middle half listed between CA$755 to CA$1,562

Certificated stones with a recently confirmed price only, 27,611 of them. Each contributes its cheapest confirmed price.

The same stone, priced differently

Typical spread

135%

Typical difference

CA$1,872

Stones compared

23,466

Across 23,466 stones of this size and shape carried by more than one retailer, the dearest listing sits 135% above the cheapest for the identical certificated diamond, a typical gap of CA$1,872. 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 Carat14,342 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
  7. 7NZ Jewellers7,567 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
  10. 10Adiamor6,474 in stock
    United States·Founded 1999·30-day returns·Ships to Canada
    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 Canada
    Terms read on the retailer’s own site, October 19, 2026
    Visit B2C Jewels
  5. 15Aurelinne5,240 in stock
    United States·Founded 2021·30-day returns·Ships to Canada
    Terms not yet verified
    Visit Aurelinne
  7. 17RockHer4,744 in stock
    United States·Founded 2016·40-day returns·Ships to Canada
    Terms not yet verified
    Visit RockHer
  14. 24Cape Diamonds3,238 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
  15. 25GemsNY3,091 in stock
    United States·Founded 1988·30-day returns·Ships to Canada
    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.

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 VVS245,187 · 57rE VS129,858 · 58rF VVS226,052 · 57rF VS119,216 · 53rD VVS214,489 · 57rD VVS19,521 · 54rE VVS18,998 · 55rD VS18,662 · 52rE VS27,401 · 45rG VVS27,277 · 44rF VS25,379 · 44rG VS15,364 · 44rF VVS12,833 · 53rD IF1,930 · 44rD FL1,801 · 33rD VS21,304 · 44rG VS2818 · 30rE IF806 · 39rH VVS2686 · 34rH VS1605 · 30rG VVS1570 · 40rF IF167 · 31rE FL148 · 31rH VS296 · 14rI VS169 · 18rH VVS168 · 8rG IF32 · 25rI VVS225 · 20r

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 23,466 identical stones carried by more than one retailer, the typical gap between the cheapest and dearest listing is 135%, about CA$1,872.

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.