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Carat Hunter · Where to buy diamonds

1.5ct · E · SI1 · Heart · Lab-grown

Every retailer carrying this exact spec, from our latest listings.

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

Market at this spec

Active listings

230

Retailers carrying

29

Price range

€181 to
€1,386

Median confirmed price

€406

Certificate mix:IGI 213

Range and median take each diamond at this spec at its cheapest recently confirmed price. They are cohort statistics, not per-retailer pricing claims.

Every retailer that stocks this spec

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

  2. 2NZ Jewellers17 in stock
    New Zealand·Founded 2006·IGI·30-day returns·Ships to Ireland
    Terms read on the retailer’s own site, October 19, 2026
    Visit NZ Jewellers
  3. 3B2C Jewels16 in stock
    United States·Founded 2004·IGI·30-day returns·Ships to Ireland
    Terms read on the retailer’s own site, October 19, 2026
    Visit B2C Jewels
  6. 6

    The Perfect Carat

    15 in stock
    US·IGI
    Terms not yet verified
Show 19 more retailers
  9. 19

    GemTrove

    4 in stock
    AU·IGI
    Terms not yet verified
  12. 22Rare Carat2 in stock
    United States·Founded 2016·IGI·30-day returns·Ships to Ireland
    Terms read on the retailer’s own site, October 19, 2026
    Visit Rare Carat
  16. 26

    Diamond Culture

    1 in stock
    HK·IGI
    Terms not yet verified
  19. 29RockHer1 in stock
    United States·Founded 2016·IGI·Ships to Ireland
    Terms not yet verified
    Visit RockHer

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.

Explore all 230 stones in this cohort

Stones at this spec now

Current examples carried by more than one retailer, so the comparison is real. Prices shown in USD.

See every 1.5ct lab grown heart diamond, all grades

How pricing is spread at this spec

For the 47 diamonds at this spec with a recently confirmed price, each taken at its cheapest confirmed price, the distribution looks like this:

  • Lowest confirmed
    €181
  • 10th percentile
    €186
  • Median
    €406
  • 75th percentile
    €664
  • 90th percentile
    €838
  • Highest confirmed
    €1,386

Cohort distribution only. No retailer named adjacent to a dollar figure in this section.

How to pick

Lowest price floor for the spec?

The cheapest confirmed prices start around €186. Use the explorer to sort by price.

Sort by price

Best cut quality for the spec?

108 of 230 active listings carry Excellent or Ideal across cut, polish and symmetry.

View top-cut subset

Want None or Faint fluorescence?

221 of 230 are graded None or Faint at this spec.

Shopping from Ireland?

17 of the 25 retailers with shipping details ship to Ireland. 8 do not. 4 retailers have not published any shipping details.

What this spec means

  • Heart: a brilliant cut with a cleft and a pointed tip, classic and recognizable.
  • E colour: colourless, indistinguishable from D to most viewers.
  • SI1 clarity: Slightly Included 1. Inclusions noticeable at 10x. Often still eye-clean depending on placement.
  • Lab-grown: chemically identical to natural diamonds, typically at least 90% less than a comparable natural cohort from 1 carat up.

Compare the top retailers carrying this spec

Side-by-side facts for the two stores carrying the most 1.5ct E SI1 heart lab grown diamonds.

Compare Loose Grown Diamond vs NZ Jewellers

Related specs

Slightly smaller carat

heart-1-25ct-e-si1-lab

Slightly larger carat

heart-2ct-e-si1-lab

One colour grade higher

heart-1-5ct-d-si1-lab

One colour grade lower

heart-1-5ct-f-si1-lab

One clarity grade higher

heart-1-5ct-e-vs2-lab

One clarity grade lower

heart-1-5ct-e-si2-lab

Same spec, natural

heart-1-5ct-e-si1-natural

Frequently asked

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.

Why is one retailer cheaper for the same certificate?

Markup and overhead vary by retailer. The same physical diamond can list at very different prices across stores. See our cross-retailer analysis for the structural reasons.

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.