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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, 57 of them, across 142,760 live listings.

Updated September 14, 2026 · Independent. Zero affiliate revenue.

The market at this size and shape

Active listings

142,760

Retailers carrying

57

Median active price

A$1,840

Grade combinations

30

Certificate mix:IGI 133,579 · GIA 5,528 · GCAL 1,691 · HRD 9 · AGS 3

What it actually costs

Lower 10% A$898Median A$1,840Upper 10% A$7,226

Middle half sell between A$1,257 to A$3,735

Certificated stones with a live price only, 38,705 of them. Each contributes its best available price.

The same stone, priced differently

Typical spread

303%

Typical difference

A$3,240

Stones compared

19,581

Across 19,581 stones of this size and shape carried by more than one retailer, the dearest listing sits 303% above the cheapest for the identical certificated diamond, a typical gap of A$3,240. 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.

Show 15 more retailers

Stock counts are updated daily. Founded, return window and shipping details are retailer-provided and were last verified September 2, 2026.

2 of the 25 retailers ship to Australia. 23 do not.

Narrow it down by grade

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

E VVS226,266 · 52rE VS123,951 · 53rD VVS215,073 · 49rF VVS211,860 · 48rF VS111,632 · 49rD VS110,918 · 51rD VVS18,162 · 43rD IF5,292 · 38rG VS14,910 · 41rE VS24,651 · 43rD FL3,982 · 29rG VVS23,411 · 40rE VVS13,037 · 43rF VS21,884 · 35rD VS21,553 · 39rH VS11,400 · 32rG VS21,064 · 37rF VVS1931 · 40rH VVS2767 · 30rE IF610 · 38rH VS2423 · 30rI VS1284 · 25rE FL158 · 26rF IF157 · 26rG VVS1133 · 29rI VVS282 · 21rI VS269 · 22rH VVS143 · 16rG IF38 · 20rF FL12 · 10r

Stones at this spec now

Live 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 60% to 80% less than a comparable natural cohort.

Frequently asked

How much do retailers differ on the same diamond?

Across 19,581 identical stones carried by more than one retailer, the typical gap between the cheapest and dearest listing is 303%, about A$3,240.

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?

Live listings refresh daily. 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 Cushion Diamonds | Carat Hunter