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Carat Hunter · Where to buy diamonds

Where to buy a 1ct lab-grown cushion diamond

Every retailer in our index stocking this size and shape, 61 of them, across 136,045 current listings.

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

The market at this size and shape

Active listings

136,045

Retailers carrying

61

Median confirmed price

A$391

Grade combinations

30

Certificate mix:IGI 130,958 · GIA 1,496 · GCAL 835 · HRD 25

What it actually costs

Half of these diamonds are listed between A$284 and A$593 (as of October 29, 2026).

Lower 10% A$264Median A$391Upper 10% A$1,117

Middle half listed between A$284 to A$593

Certificated stones with a recently confirmed price only, 16,901 of them. Each contributes its cheapest confirmed price.

The same stone, priced differently

Typical spread

355%

Typical difference

A$1,261

Stones compared

13,712

Across 13,712 stones of this size and shape carried by more than one retailer, the dearest listing sits 355% above the cheapest for the identical certificated diamond, a typical gap of A$1,261. 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. 4B2C Jewels7,428 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. 5Adiamor7,404 in stock
    United States·Founded 1999·30-day returns
    Terms not yet verified
    Visit Adiamor
  9. 9Rare Carat6,605 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
Show 15 more retailers
  1. 11Cape Diamonds5,584 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
  2. 12Yorxs5,507 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.

16 of the 25 retailers ship to Australia. 9 do not.

Narrow it down by grade

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

D VVS231,173 · 57rD VS121,561 · 55rE VS117,392 · 54rD VVS116,797 · 54rE VVS214,728 · 55rE VVS15,795 · 52rD VS24,980 · 49rE VS24,476 · 49rF VS14,027 · 49rF VVS23,556 · 53rD IF2,731 · 49rD FL1,851 · 38rF VS21,398 · 42rE IF1,098 · 42rG VS11,087 · 41rG VVS2874 · 47rF VVS1784 · 51rG VS2398 · 34rE FL392 · 26rH VS1268 · 34rH VVS2166 · 31rG VVS1117 · 29rH VS2111 · 24rF IF109 · 35rI VS142 · 20rF FL33 · 21rI VS230 · 14rH VVS126 · 14rI VVS224 · 14rG FL13 · 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 13,712 identical stones carried by more than one retailer, the typical gap between the cheapest and dearest listing is 355%, about A$1,261.

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.