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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 161,540 current listings.

Updated October 30, 2026 · Independent. Zero affiliate revenue.

The market at this size and shape

Active listings

161,540

Retailers carrying

63

Median confirmed price

NZ$1,629

Grade combinations

30

Certificate mix:IGI 150,292 · GIA 6,677 · GCAL 2,377 · HRD 9 · AGS 3

What it actually costs

Half of these diamonds are listed between NZ$1,068 and NZ$2,715 (as of October 30, 2026).

Lower 10% NZ$923Median NZ$1,629Upper 10% NZ$5,045

Middle half listed between NZ$1,068 to NZ$2,715

Certificated stones with a recently confirmed price only, 20,852 of them. Each contributes its cheapest confirmed price.

The same stone, priced differently

Typical spread

294%

Typical difference

NZ$4,515

Stones compared

16,568

Across 16,568 stones of this size and shape carried by more than one retailer, the dearest listing sits 294% above the cheapest for the identical certificated diamond, a typical gap of NZ$4,515. 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 Carat11,360 in stock
    United States·Founded 2016·30-day returns·Ships to New Zealand
    Terms read on the retailer’s own site, October 19, 2026
    Visit Rare Carat
  8. 8Adiamor7,286 in stock
    United States·Founded 1999·30-day returns
    Terms not yet verified
    Visit Adiamor
  9. 9B2C Jewels6,982 in stock
    United States·Founded 2004·30-day returns·Ships to New Zealand
    Terms read on the retailer’s own site, October 19, 2026
    Visit B2C Jewels
Show 15 more retailers
  2. 12RockHer5,702 in stock
    United States·Founded 2016·40-day returns·Ships to New Zealand
    Terms not yet verified
    Visit RockHer
  3. 13Cape Diamonds5,533 in stock
    South Africa·Founded 2005·7-day returns·Ships to New Zealand
    Terms read on the retailer’s own site, June 15, 2026
    Visit Cape Diamonds
  6. 16Yorxs4,187 in stock
    Germany·Founded 2011·100-day returns
    Terms not yet verified
    Visit Yorxs
  11. 21GemsNY3,224 in stock
    United States·Founded 1988·30-day returns·Ships to New Zealand
    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.

15 of the 25 retailers ship to New Zealand. 10 do not.

Narrow it down by grade

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

E VS124,108 · 62rE VVS223,676 · 59rD VVS215,189 · 56rD VS112,992 · 58rD VVS112,894 · 52rF VVS212,547 · 57rF VS112,146 · 58rD IF8,999 · 44rG VS16,555 · 50rE VS25,606 · 52rD FL5,457 · 40rE VVS14,288 · 51rG VVS23,872 · 49rF VS22,363 · 42rD VS22,068 · 49rH VS12,010 · 41rG VS21,757 · 44rF VVS11,293 · 46rE IF945 · 46rH VVS2934 · 34rH VS2603 · 32rI VS1350 · 28rF IF243 · 33rG VVS1227 · 39rE FL187 · 34rI VVS291 · 20rG IF51 · 25rI VS238 · 19rH VVS137 · 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 16,568 identical stones carried by more than one retailer, the typical gap between the cheapest and dearest listing is 294%, about NZ$4,515.

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.

Where to Buy 3ct Lab Grown Cushion Diamonds | Carat Hunter