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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, 64 of them, across 166,194 current listings.

Updated November 6, 2026 · Independent. Zero affiliate revenue.

The market at this size and shape

Active listings

166,194

Retailers carrying

64

Median confirmed price

NZ$1,577

Grade combinations

48

Certificate mix:IGI 154,430 · GIA 6,819 · GCAL 2,437 · HRD 10 · AGS 6

What it actually costs

Half of these diamonds are listed between NZ$1,075 and NZ$2,689 (as of November 6, 2026).

Lower 10% NZ$934Median NZ$1,577Upper 10% NZ$4,858

Middle half listed between NZ$1,075 to NZ$2,689

Certificated stones with a recently confirmed price only, 21,042 of them. Each contributes its cheapest confirmed price.

The same stone, priced differently

As of November 6, 2026, the same certified diamond typically costs 44% more at a typical retailer than at the cheapest for lab-grown stones, and 20% more for natural ones (the median across stones listed by two or more retailers). Comparing shows you the cheapest of the retailers listing the same stone.

Every retailer that stocks this spec

Ranked by active inventory count. Selection is mechanical, not editorial.

  1. 1Rare Carat11,415 in stock
    United States·Founded 2016·GCAL, GIA, IGI·30-day returns·Ships to New Zealand
    Terms read on the retailer’s own site, October 19, 2026
    Visit Rare Carat
  7. 7Adiamor7,528 in stock
    United States·Founded 1999·GCAL, GIA, IGI
    Terms not yet verified
    Visit Adiamor
  8. 8B2C Jewels6,676 in stock
    United States·Founded 2004·GIA, IGI·30-day returns·Ships to New Zealand
    Terms read on the retailer’s own site, October 19, 2026
    Visit B2C Jewels
Show 54 more retailers
  1. 11RockHer6,029 in stock
    United States·Founded 2016·GIA, IGI·Ships to New Zealand
    Terms not yet verified
    Visit RockHer
  4. 14Yorxs4,539 in stock
    Germany·Founded 2011·GIA, IGI
    Terms not yet verified
    Visit Yorxs
  5. 15Cape Diamonds4,394 in stock
    South Africa·Founded 2005·GIA, IGI·7-day returns·Ships to New Zealand
    Terms read on the retailer’s own site, June 15, 2026
    Visit Cape Diamonds
  10. 20GemsNY3,603 in stock
    United States·Founded 1988·GCAL, GIA, IGI·Ships to New Zealand
    Terms not yet verified
    Visit GemsNY
  24. 34Blue Nile1,118 in stock
    United States·Founded 1999·GCAL, GIA, IGI·Ships to New Zealand
    Terms not yet verified
    Visit Blue Nile
  29. 39Allurez337 in stock
    United States·Founded 2010·GIA, IGI·Ships to New Zealand
    Terms not yet verified
    Visit Allurez
  31. 41

    The Perfect Carat

    274 in stock
    US·GCAL, GIA, IGI
    Terms not yet verified
  32. 42Jared223 in stock
    United States·Founded 1993·AGS, GCAL, GIA, IGI
    Terms not yet verified
    Visit Jared
  34. 44Zales208 in stock
    United States·Founded 1924·AGS, GCAL, GIA, IGI
    Terms not yet verified
    Visit Zales
  36. 46NZ Jewellers170 in stock
    New Zealand·Founded 2006·IGI·30-day returns·Ships to New Zealand
    Terms read on the retailer’s own site, October 19, 2026
    Visit NZ Jewellers
  39. 49

    GemTrove

    121 in stock
    AU·GIA, IGI
    Terms not yet verified
  41. 51ZCOVA82 in stock
    Malaysia·Founded 2015·IGI·Ships to New Zealand
    Terms not yet verified
    Visit ZCOVA
  46. 5625karats22 in stock
    United States·Founded 2008·IGI·60-day returns·Ships to New Zealand
    Terms read on the retailer’s own site, June 15, 2026
    Visit 25karats
  48. 58

    Distinctive Gem

    8 in stock
    US·GIA
    Terms not yet verified
  49. 59VRAI7 in stock
    United States·Founded 2014·IGI
    Terms not yet verified
    Visit VRAI
  50. 60

    Whiteflash

    6 in stock
    US·GIA, IGI
    Terms not yet verified
  52. 62

    Lauren B

    5 in stock
    US
    Terms not yet verified
  53. 63

    Diamovida

    2 in stock
    CA·IGI
    Terms not yet verified
  54. 64

    Good Old Gold

    2 in stock
    US·GIA, IGI
    Terms not yet verified

Stock counts reflect current listings. 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.

30 of the 56 retailers with shipping details ship to New Zealand. 26 do not. 8 retailers have not published any shipping details.

Narrow it down by grade

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

E VVS224,683 · 60rE VS123,296 · 62rD VVS215,167 · 57rF VVS213,571 · 58rD VS113,167 · 58rD VVS113,037 · 53rF VS112,637 · 58rD IF9,196 · 45rG VS16,628 · 50rD FL5,796 · 41rE VS25,545 · 52rE VVS14,294 · 54rG VVS23,955 · 50rF VS22,333 · 42rD VS22,107 · 50rH VS11,966 · 39rG VS21,786 · 45rF VVS11,448 · 51rE IF954 · 47rH VVS2883 · 34rH VS2606 · 33rE SI1555 · 34rI VS1366 · 32rF SI1354 · 33rG SI1282 · 35rF IF246 · 32rG VVS1242 · 38rE FL186 · 35rH SI1144 · 20rD SI197 · 24rJ VS192 · 18rI VVS288 · 20rG IF52 · 25rG SI244 · 20rK VS143 · 14rH VVS142 · 15rI SI142 · 17rI VS235 · 18rE SI230 · 16rJ VS229 · 16rF SI228 · 16rJ VVS227 · 13rH SI223 · 11rK VS219 · 9rD SI215 · 15rF FL15 · 14rJ SI113 · 10rJ SI212 · 9r

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?

As of November 6, 2026, the same certified diamond typically costs 44% more at a typical retailer than at the cheapest for lab-grown stones, and 20% more for natural ones (the median across stones listed by two or more retailers). Comparing shows you the cheapest of the retailers listing the same stone.

Can I see retailers for one exact grade?

Yes. Each of the 48 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.