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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 173,931 current listings.

Updated October 29, 2026 · Independent. Zero affiliate revenue.

The market at this size and shape

Active listings

173,931

Retailers carrying

63

Median confirmed price

A$944

Grade combinations

28

Certificate mix:IGI 167,151 · GCAL 989 · GIA 590 · HRD 2

What it actually costs

Half of these diamonds are listed between A$782 and A$1,654 (as of October 29, 2026).

Lower 10% A$731Median A$944Upper 10% A$3,514

Middle half listed between A$782 to A$1,654

Certificated stones with a recently confirmed price only, 26,662 of them. Each contributes its cheapest confirmed price.

The same stone, priced differently

Typical spread

141%

Typical difference

A$1,921

Stones compared

21,993

Across 21,993 stones of this size and shape carried by more than one retailer, the dearest listing sits 141% above the cheapest for the identical certificated diamond, a typical gap of A$1,921. 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 Australia
    Terms read on the retailer’s own site, October 19, 2026
    Visit Rare Carat
  7. 7NZ Jewellers5,827 in stock
    New Zealand·Founded 2006·30-day returns·Ships to Australia
    Terms read on the retailer’s own site, October 19, 2026
    Visit NZ Jewellers
  9. 9Adiamor5,690 in stock
    United States·Founded 1999·30-day returns
    Terms not yet verified
    Visit Adiamor
Show 15 more retailers
  3. 13B2C Jewels5,264 in stock
    United States·Founded 2004·30-day returns·Ships to Australia
    Terms read on the retailer’s own site, October 19, 2026
    Visit B2C Jewels
  5. 15

    The Perfect Carat

    4,615 in stock
    US
    Terms not yet verified
  7. 17Aurelinne3,984 in stock
    United States·Founded 2021·30-day returns·Ships to Australia
    Terms not yet verified
    Visit Aurelinne
  9. 19RockHer3,699 in stock
    United States·Founded 2016·40-day returns·Ships to Australia
    Terms not yet verified
    Visit RockHer
  11. 21Cape Diamonds3,175 in stock
    South Africa·Founded 2005·7-day returns·Ships to Australia
    Terms read on the retailer’s own site, June 15, 2026
    Visit Cape Diamonds
  12. 22Yorxs3,100 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.

14 of the 25 retailers ship to Australia. 11 do not.

Narrow it down by grade

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

E VVS234,608 · 56rE VS125,326 · 59rF VVS223,069 · 55rF VS117,946 · 51rD VVS212,293 · 55rD VVS18,795 · 51rE VVS17,670 · 53rG VVS27,575 · 42rD VS17,273 · 50rE VS27,167 · 42rF VS25,516 · 44rG VS15,356 · 43rF VVS12,420 · 52rD IF1,848 · 44rD FL1,778 · 33rD VS21,193 · 41rG VS2856 · 30rE IF757 · 36rH VVS2703 · 33rH VS1656 · 31rG VVS1528 · 39rF IF153 · 30rE FL140 · 29rH VS298 · 14rH VVS168 · 7rI VS168 · 20rG IF33 · 26rI VVS229 · 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 21,993 identical stones carried by more than one retailer, the typical gap between the cheapest and dearest listing is 141%, about A$1,921.

Can I see retailers for one exact grade?

Yes. Each of the 28 colour 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.

Where to Buy 3ct Lab Grown Marquise Diamonds | Carat Hunter