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Carat Hunter · Where to buy diamonds

Where to buy a 3ct lab-grown heart diamond

Every retailer in our index stocking this size and shape, 57 of them, across 36,490 current listings.

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

The market at this size and shape

Active listings

36,490

Retailers carrying

57

Median confirmed price

NZ$1,717

Grade combinations

38

Certificate mix:IGI 30,290 · GIA 5,345 · HRD 55 · GCAL 23

What it actually costs

Half of these diamonds are listed between NZ$1,245 and NZ$2,597 (as of November 6, 2026).

Lower 10% NZ$990Median NZ$1,717Upper 10% NZ$4,173

Middle half listed between NZ$1,245 to NZ$2,597

Certificated stones with a recently confirmed price only, 3,779 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.

  2. 2Carbon Sparkle2,040 in stock
    United States·GCAL, GIA, HRD, IGI·21-day returns·Ships to New Zealand
    Terms read on the retailer’s own site, September 2, 2026
    Visit Carbon Sparkle
  3. 3NZ Jewellers1,999 in stock
    New Zealand·Founded 2006·GCAL, GIA, HRD, IGI·30-day returns·Ships to New Zealand
    Terms read on the retailer’s own site, October 19, 2026
    Visit NZ Jewellers
  5. 5

    The Perfect Carat

    1,771 in stock
    US·GCAL, GIA, HRD, IGI
    Terms not yet verified
  7. 7Adiamor1,679 in stock
    United States·Founded 1999·GCAL, GIA, IGI
    Terms not yet verified
    Visit Adiamor
  8. 8Aurelinne1,650 in stock
    United States·Founded 2021·GIA, HRD, IGI·Ships to New Zealand
    Terms not yet verified
    Visit Aurelinne
Show 47 more retailers
  1. 11B2C Jewels1,399 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
  2. 12RockHer1,297 in stock
    United States·Founded 2016·GIA, IGI·Ships to New Zealand
    Terms not yet verified
    Visit RockHer
  11. 21Cape Diamonds816 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
  19. 29Yorxs385 in stock
    Germany·Founded 2011·GIA, IGI
    Terms not yet verified
    Visit Yorxs
  21. 31

    GemTrove

    259 in stock
    AU·GIA, IGI
    Terms not yet verified
  22. 32GemsNY200 in stock
    United States·Founded 1988·GCAL, GIA, IGI·Ships to New Zealand
    Terms not yet verified
    Visit GemsNY
  27. 37Rare Carat142 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
  29. 39Allurez138 in stock
    United States·Founded 2010·GIA, IGI·Ships to New Zealand
    Terms not yet verified
    Visit Allurez
  37. 47ZCOVA18 in stock
    Malaysia·Founded 2015·IGI·Ships to New Zealand
    Terms not yet verified
    Visit ZCOVA
  41. 51Jared13 in stock
    United States·Founded 1993·GIA, IGI
    Terms not yet verified
    Visit Jared
  42. 5225karats12 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
  43. 53Zales11 in stock
    United States·Founded 1924·GIA, IGI
    Terms not yet verified
    Visit Zales
  46. 56

    Diamond Culture

    2 in stock
    HK·IGI
    Terms not yet verified
  47. 57

    Lauren B

    1 in stock
    US
    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.

29 of the 52 retailers with shipping details ship to New Zealand. 23 do not. 5 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 VS15,631 · 52rD VS15,480 · 49rE VVS25,421 · 50rD VVS24,977 · 52rF VVS22,130 · 45rF VS12,046 · 47rD VVS11,789 · 47rE VVS11,505 · 43rG VS11,120 · 43rE VS21,107 · 43rD IF1,040 · 48rD FL652 · 34rD VS2598 · 40rF VS2477 · 40rG VVS2448 · 41rF VVS1380 · 40rG VS2334 · 34rE IF281 · 33rH VVS2142 · 30rF SI1141 · 31rH VS1111 · 26rG SI196 · 29rG VVS168 · 28rH SI168 · 27rE SI167 · 23rE FL62 · 24rH VS245 · 23rJ VVS238 · 13rD SI135 · 20rI VVS235 · 14rI VS132 · 17rF IF26 · 18rH VVS124 · 22rG SI217 · 16rD SI216 · 16rF SI216 · 15rG IF14 · 14rH SI213 · 5r

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

  • Heart: a brilliant cut with a cleft and a pointed tip, classic and recognizable.
  • 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 38 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.