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Carat Hunter · Where to buy diamonds

1.5ct · E · SI1 · Cushion · 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

609

Retailers carrying

36

Price range

€173 to
€2,584

Median confirmed price

€580

Certificate mix:IGI 537 · GIA 51 · GCAL 3

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. 2B2C Jewels57 in stock
    United States·Founded 2004·GIA, IGI·30-day returns·Ships to Ireland
    Terms read on the retailer’s own site, October 19, 2026
    Visit B2C Jewels
  6. 6Rare Carat38 in stock
    United States·Founded 2016·GIA, IGI·30-day returns·Ships to Ireland
    Terms read on the retailer’s own site, October 19, 2026
    Visit Rare Carat
Show 26 more retailers
  2. 12Yorxs23 in stock
    Germany·Founded 2011·GIA, IGI
    Terms not yet verified
    Visit Yorxs
  6. 16Allurez12 in stock
    United States·Founded 2010·Ships to Ireland
    Terms not yet verified
    Visit Allurez
  9. 19RockHer8 in stock
    United States·Founded 2016·GIA, IGI·Ships to Ireland
    Terms not yet verified
    Visit RockHer
  12. 22Jared5 in stock
    United States·Founded 1993·GIA, IGI
    Terms not yet verified
    Visit Jared
  16. 26GemsNY4 in stock
    United States·Founded 1988·GIA, IGI·Ships to Ireland
    Terms not yet verified
    Visit GemsNY
  20. 30Zales3 in stock
    United States·Founded 1924·GIA, IGI
    Terms not yet verified
    Visit Zales
  22. 3225karats1 in stock
    United States·Founded 2008·IGI·60-day returns·Ships to Ireland
    Terms read on the retailer’s own site, June 15, 2026
    Visit 25karats
  24. 34

    GemTrove

    1 in stock
    AU·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.

Explore all 609 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 cushion diamond, all grades

How pricing is spread at this spec

For the 208 diamonds at this spec with a recently confirmed price, each taken at its cheapest confirmed price, the distribution looks like this:

  • Lowest confirmed
    €173
  • 10th percentile
    €227
  • Median
    €580
  • 75th percentile
    €856
  • 90th percentile
    €1,346
  • Highest confirmed
    €2,584

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 €227. Use the explorer to sort by price.

Sort by price

Best cut quality for the spec?

338 of 609 active listings carry Excellent or Ideal across cut, polish and symmetry.

View top-cut subset

GIA-graded only?

51 of 609 (8%) carry GIA. 22 retailers stock GIA at this spec.

Want None or Faint fluorescence?

536 of 609 are graded None or Faint at this spec.

Shopping from Ireland?

18 of the 34 retailers with shipping details ship to Ireland. 16 do not. 2 retailers have not published any shipping details.

What this spec means

  • Cushion: a softened-corner square or rectangle with a vintage feel.
  • 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 cushion lab grown diamonds.

Compare Diamond Quarter vs B2C Jewels

Related specs

Slightly smaller carat

cushion-1-25ct-e-si1-lab

Slightly larger carat

cushion-2ct-e-si1-lab

One colour grade higher

cushion-1-5ct-d-si1-lab

One colour grade lower

cushion-1-5ct-f-si1-lab

One clarity grade higher

cushion-1-5ct-e-vs2-lab

One clarity grade lower

cushion-1-5ct-e-si2-lab

Same spec, natural

cushion-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.