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Carat Hunter · Where to buy diamonds

Where to buy a 1.5ct lab-grown cushion diamond

Every retailer in our index stocking this size and shape, 71 of them, across 110,514 current listings.

Updated October 31, 2026 · Independent. Zero affiliate revenue.

The market at this size and shape

Active listings

110,514

Retailers carrying

71

Median confirmed price

A$558

Grade combinations

30

Certificate mix:IGI 105,494 · GIA 2,534 · GCAL 967 · HRD 4

What it actually costs

Half of these diamonds are listed between A$410 and A$823 (as of October 31, 2026).

Lower 10% A$359Median A$558Upper 10% A$1,791

Middle half listed between A$410 to A$823

Certificated stones with a recently confirmed price only, 11,788 of them. Each contributes its cheapest confirmed price.

The same stone, priced differently

Typical spread

364%

Typical difference

A$1,847

Stones compared

9,712

Across 9,712 stones of this size and shape carried by more than one retailer, the dearest listing sits 364% above the cheapest for the identical certificated diamond, a typical gap of A$1,847. 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.

  4. 4Rare Carat6,222 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
  5. 5B2C Jewels6,090 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
  6. 6Adiamor5,563 in stock
    United States·Founded 1999·30-day returns
    Terms not yet verified
    Visit Adiamor
Show 15 more retailers
  3. 13Yorxs4,051 in stock
    Germany·Founded 2011·100-day returns
    Terms not yet verified
    Visit Yorxs
  4. 14Cape Diamonds3,540 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
  10. 20RockHer2,347 in stock
    United States·Founded 2016·40-day returns·Ships to Australia
    Terms not yet verified
    Visit RockHer

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 Australia. 7 do not.

Narrow it down by grade

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

D VVS220,807 · 57rE VVS215,813 · 59rE VS114,083 · 59rD VS112,997 · 54rD VVS111,688 · 54rE VVS15,064 · 55rF VS14,933 · 55rF VVS24,671 · 52rD VS23,100 · 48rE VS22,922 · 52rG VS12,749 · 48rD IF2,151 · 43rD FL1,919 · 39rG VVS21,704 · 42rF VS21,472 · 49rF VVS11,067 · 45rG VS2924 · 39rE IF606 · 43rH VS1563 · 40rH VVS2259 · 35rE FL240 · 27rG VVS1183 · 34rH VS2178 · 30rF IF121 · 28rG IF84 · 37rI VS175 · 26rI VS251 · 24rH VVS144 · 17rF FL23 · 18rI VVS223 · 8r

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 9,712 identical stones carried by more than one retailer, the typical gap between the cheapest and dearest listing is 364%, about A$1,847.

Can I see retailers for one exact grade?

Yes. Each of the 30 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.