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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, 56 of them, across 33,328 current listings.

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

The market at this size and shape

Active listings

33,328

Retailers carrying

56

Median confirmed price

A$1,415

Grade combinations

28

Certificate mix:IGI 27,301 · GIA 5,290 · HRD 55 · GCAL 22

What it actually costs

Half of these diamonds are listed between A$1,017 and A$2,063 (as of October 29, 2026).

Lower 10% A$792Median A$1,415Upper 10% A$3,434

Middle half listed between A$1,017 to A$2,063

Certificated stones with a recently confirmed price only, 3,631 of them. Each contributes its cheapest confirmed price.

The same stone, priced differently

Typical spread

281%

Typical difference

A$3,496

Stones compared

2,977

Across 2,977 stones of this size and shape carried by more than one retailer, the dearest listing sits 281% above the cheapest for the identical certificated diamond, a typical gap of A$3,496. 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.

  2. 2NZ Jewellers1,689 in stock
    New Zealand·Founded 2006·30-day returns·Ships to Australia
    Terms read on the retailer’s own site, October 19, 2026
    Visit NZ Jewellers
  5. 5Adiamor1,570 in stock
    United States·Founded 1999·30-day returns
    Terms not yet verified
    Visit Adiamor
  7. 7B2C Jewels1,478 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
  8. 8

    The Perfect Carat

    1,427 in stock
    US
    Terms not yet verified
  10. 10Aurelinne1,414 in stock
    United States·Founded 2021·30-day returns·Ships to Australia
    Terms not yet verified
    Visit Aurelinne
Show 15 more retailers
  3. 13RockHer1,222 in stock
    United States·Founded 2016·40-day returns·Ships to Australia
    Terms not yet verified
    Visit RockHer
  11. 21Cape Diamonds792 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

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.

18 of the 25 retailers ship to Australia. 7 do not.

Narrow it down by grade

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

D VS15,251 · 45rE VS15,189 · 51rD VVS24,792 · 51rE VVS24,726 · 48rF VVS21,923 · 45rF VS11,753 · 45rD VVS11,687 · 46rE VVS11,348 · 43rG VS11,089 · 43rE VS21,026 · 42rD IF980 · 47rD VS2615 · 40rD FL593 · 33rF VS2451 · 39rG VVS2392 · 37rF VVS1381 · 39rG VS2338 · 34rE IF249 · 32rH VVS2137 · 27rH VS1118 · 25rG VVS169 · 28rE FL58 · 23rH VS244 · 23rI VS132 · 17rI VVS231 · 14rH VVS122 · 22rF IF19 · 16rG IF14 · 14r

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?

Across 2,977 identical stones carried by more than one retailer, the typical gap between the cheapest and dearest listing is 281%, about A$3,496.

Can I see retailers for one exact grade?

Yes. Each of the 28 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.