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Carat Hunter · Where to buy diamonds

1.5ct · I · SI1 · Cushion · Natural

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

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

Market at this spec

Active listings

3,307

Retailers carrying

58

Price range

A$2,925 to
A$16,479

Median confirmed price

A$6,411

Certificate mix:GIA 3,012 · HRD 74 · IGI 68

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.

  1. 1Yorxs190 in stock
    Germany·Founded 2011·GIA, HRD, IGI
    Terms not yet verified
    Visit Yorxs
  6. 6Rare Carat128 in stock
    United States·Founded 2016·GIA, IGI·30-day returns·Ships to Australia
    Terms read on the retailer’s own site, October 19, 2026
    Visit Rare Carat
  7. 7Cape Diamonds122 in stock
    South Africa·Founded 2005·GIA, IGI·7-day returns·Ships to Australia
    Terms read on the retailer’s own site, June 15, 2026
    Visit Cape Diamonds
  10. 10RockHer107 in stock
    United States·Founded 2016·GIA, IGI·Ships to Australia
    Terms not yet verified
    Visit RockHer
Show 48 more retailers
  2. 12B2C Jewels98 in stock
    United States·Founded 2004·GIA, IGI·30-day returns·Ships to Australia
    Terms read on the retailer’s own site, October 19, 2026
    Visit B2C Jewels
  8. 18

    GemTrove

    80 in stock
    AU·GIA, HRD, IGI·Ships to Australia
    Terms not yet verified
  10. 20Allurez74 in stock
    United States·Founded 2010·Ships to Australia
    Terms not yet verified
    Visit Allurez
  16. 26Jared55 in stock
    United States·Founded 1993·GIA, IGI
    Terms not yet verified
    Visit Jared
  17. 27Zales54 in stock
    United States·Founded 1924·GIA, IGI
    Terms not yet verified
    Visit Zales
  20. 30GemsNY50 in stock
    United States·Founded 1988·GIA, IGI·Ships to Australia
    Terms not yet verified
    Visit GemsNY
  23. 33

    The Perfect Carat

    36 in stock
    US·GIA, HRD
    Terms not yet verified
  35. 45NZ Jewellers8 in stock
    New Zealand·Founded 2006·HRD·30-day returns·Ships to Australia
    Terms read on the retailer’s own site, October 19, 2026
    Visit NZ Jewellers
  44. 54ZCOVA3 in stock
    Malaysia·Founded 2015·GIA·Ships to Australia
    Terms not yet verified
    Visit ZCOVA

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 3,307 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 natural cushion diamond, all grades

How pricing is spread at this spec

For the 713 diamonds at this spec with a recently confirmed price, each taken at its cheapest confirmed price, the distribution looks like this:

  • Lowest confirmed
    A$2,925
  • 10th percentile
    A$4,169
  • Median
    A$6,411
  • 75th percentile
    A$8,203
  • 90th percentile
    A$10,261
  • Highest confirmed
    A$16,479

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 A$4,169. Use the explorer to sort by price.

Sort by price

Best cut quality for the spec?

1,154 of 3,307 active listings carry Excellent or Ideal across cut, polish and symmetry.

View top-cut subset

GIA-graded only?

3,012 of 3,307 (91%) carry GIA. 52 retailers stock GIA at this spec.

Want None or Faint fluorescence?

2,981 of 3,307 are graded None or Faint at this spec.

Shopping from Australia?

36 of the 56 retailers with shipping details ship to Australia. 20 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.
  • I colour: near-colourless, with a faint warm tint just detectable in larger stones.
  • SI1 clarity: Slightly Included 1. Inclusions noticeable at 10x. Often still eye-clean depending on placement.
  • Natural: mined diamonds with the certification, provenance and resale profile traditional buyers expect.

Compare the top retailers carrying this spec

Side-by-side facts for the two stores carrying the most 1.5ct I SI1 cushion natural diamonds.

Compare Yorxs vs MOH London

Related specs

Slightly smaller carat

cushion-1-25ct-i-si1-natural

Slightly larger carat

cushion-2ct-i-si1-natural

One colour grade higher

cushion-1-5ct-h-si1-natural

One colour grade lower

cushion-1-5ct-j-si1-natural

One clarity grade higher

cushion-1-5ct-i-vs2-natural

One clarity grade lower

cushion-1-5ct-i-si2-natural

Same spec, lab grown

cushion-1-5ct-i-si1-lab

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.

Where to Buy 1.5ct I SI1 Cushion Natural Diamonds | Carat Hunter