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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 196,117 current listings.

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

The market at this size and shape

Active listings

196,117

Retailers carrying

62

Median confirmed price

$644

Grade combinations

28

Certificate mix:IGI 188,280 · GCAL 965 · GIA 570 · HRD 2

What it actually costs

Half of these diamonds are listed between $543 and $1,114 (as of November 4, 2026).

Lower 10% $510Median $644Upper 10% $2,305

Middle half listed between $543 to $1,114

Certificated stones with a recently confirmed price only, 27,601 of them. Each contributes its cheapest confirmed price.

The same stone, priced differently

Typical spread

135%

Typical difference

$1,342

Stones compared

23,419

Across 23,419 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 $1,342. 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 United States
    Terms read on the retailer’s own site, October 19, 2026
    Visit Rare Carat
  6. 6Brilliance7,579 in stock
    United States·Founded 2002·30-day returns·Ships to United States
    Terms not yet verified
    Visit Brilliance
  7. 7NZ Jewellers7,567 in stock
    New Zealand·Founded 2006·30-day returns·Ships to United States
    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 United States
    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 United States
    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 United States
    Terms not yet verified
    Visit Aurelinne
  7. 17RockHer4,744 in stock
    United States·Founded 2016·40-day returns·Ships to United States
    Terms not yet verified
    Visit RockHer
  8. 18Moon Ocean4,620 in stock
    United Kingdom·Founded 2022·30-day returns·Ships to United States
    Terms not yet verified
    Visit Moon Ocean
  14. 24Cape Diamonds3,238 in stock
    South Africa·Founded 2005·7-day returns·Ships to United States
    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 United States
    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.

20 of the 25 retailers ship to United States. 5 do not.

Narrow it down by grade

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

E VVS244,163 · 56rE VS129,421 · 57rF VVS225,587 · 56rF VS118,960 · 52rD VVS214,155 · 56rD VVS19,462 · 53rE VVS18,868 · 55rD VS18,438 · 51rE VS27,326 · 44rG VVS27,216 · 44rF VS25,341 · 44rG VS15,317 · 43rF VVS12,818 · 53rD IF1,909 · 44rD FL1,783 · 33rD VS21,271 · 44rG VS2821 · 30rE IF801 · 39rH VVS2681 · 33rH VS1610 · 30rG VVS1564 · 40rF IF165 · 31rE FL142 · 29rH VS296 · 14rI VS170 · 18rH VVS164 · 6rG IF32 · 25rI VVS226 · 21r

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 23,419 identical stones carried by more than one retailer, the typical gap between the cheapest and dearest listing is 135%, about $1,342.

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.