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Carat Hunter · Where to buy diamonds

Where to buy a 3ct lab-grown cushion diamond

Every retailer in our index stocking this size and shape, 63 of them, across 160,220 current listings.

Updated November 2, 2026 · Independent. Zero affiliate revenue.

The market at this size and shape

Active listings

160,220

Retailers carrying

63

Median confirmed price

$900

Grade combinations

30

Certificate mix:IGI 148,827 · GIA 6,690 · GCAL 2,391 · HRD 9 · AGS 3

What it actually costs

Half of these diamonds are listed between $596 and $1,561 (as of November 2, 2026).

Lower 10% $518Median $900Upper 10% $2,917

Middle half listed between $596 to $1,561

Certificated stones with a recently confirmed price only, 20,740 of them. Each contributes its cheapest confirmed price.

The same stone, priced differently

Typical spread

301%

Typical difference

$2,553

Stones compared

16,716

Across 16,716 stones of this size and shape carried by more than one retailer, the dearest listing sits 301% above the cheapest for the identical certificated diamond, a typical gap of $2,553. 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.

  1. 1Rare Carat11,649 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. 6Brilliance7,743 in stock
    United States·Founded 2002·30-day returns·Ships to United States
    Terms not yet verified
    Visit Brilliance
  7. 7Adiamor7,174 in stock
    United States·Founded 1999·30-day returns·Ships to United States
    Terms not yet verified
    Visit Adiamor
  8. 8B2C Jewels7,029 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
Show 15 more retailers
  1. 11RockHer5,691 in stock
    United States·Founded 2016·40-day returns·Ships to United States
    Terms not yet verified
    Visit RockHer
  2. 12Moon Ocean5,056 in stock
    United Kingdom·Founded 2022·30-day returns·Ships to United States
    Terms not yet verified
    Visit Moon Ocean
  4. 14Yorxs4,281 in stock
    Germany·Founded 2011·100-day returns
    Terms not yet verified
    Visit Yorxs
  5. 15Cape Diamonds4,261 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
  11. 21GemsNY3,228 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.

19 of the 25 retailers ship to United States. 6 do not.

Narrow it down by grade

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

E VVS223,321 · 59rE VS123,187 · 62rD VVS215,093 · 56rD VS113,137 · 58rD VVS112,742 · 52rF VVS212,590 · 57rF VS112,121 · 58rD IF9,039 · 44rG VS16,567 · 50rE VS25,565 · 52rD FL5,506 · 40rE VVS14,285 · 52rG VVS23,842 · 49rF VS22,370 · 42rD VS22,068 · 49rH VS11,990 · 42rG VS21,779 · 43rF VVS11,332 · 46rE IF953 · 46rH VVS2903 · 34rH VS2598 · 32rI VS1343 · 28rF IF247 · 33rG VVS1229 · 39rE FL184 · 34rI VVS289 · 20rG IF52 · 25rI VS238 · 19rH VVS136 · 15rF FL14 · 13r

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

  • Cushion: a softened-corner square or rectangle with a vintage feel.
  • 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 16,716 identical stones carried by more than one retailer, the typical gap between the cheapest and dearest listing is 301%, about $2,553.

Can I see retailers for one exact grade?

Yes. Each of the 30 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.