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Carat Hunter · Where to buy diamonds

1ct · 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

3,145

Retailers carrying

58

Price range

$825 to
$6,278

Median confirmed price

$1,824

Certificate mix:GIA 2,744 · HRD 135 · IGI 76

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. 1Yorxs242 in stock
    Germany·Founded 2011·GIA, HRD, IGI
    Terms not yet verified
    Visit Yorxs
  5. 5Rare Carat147 in stock
    United States·Founded 2016·GIA, IGI·30-day returns·Ships to United States
    Terms read on the retailer’s own site, October 19, 2026
    Visit Rare Carat
  9. 9Cape Diamonds107 in stock
    South Africa·Founded 2005·GIA, IGI·7-day returns·Ships to United States
    Terms read on the retailer’s own site, June 15, 2026
    Visit Cape Diamonds
  10. 10B2C Jewels105 in stock
    United States·Founded 2004·GIA, HRD, IGI·30-day returns·Ships to United States
    Terms read on the retailer’s own site, October 19, 2026
    Visit B2C Jewels
Show 48 more retailers
  1. 11Adiamor96 in stock
    United States·Founded 1999·GIA·Ships to United States
    Terms not yet verified
    Visit Adiamor
  2. 12Allurez96 in stock
    United States·Founded 2010·Ships to United States
    Terms not yet verified
    Visit Allurez
  4. 14Brilliance91 in stock
    United States·Founded 2002·EGL, GIA, HRD, IGI·Ships to United States
    Terms not yet verified
    Visit Brilliance
  6. 16RockHer87 in stock
    United States·Founded 2016·GIA, IGI·Ships to United States
    Terms not yet verified
    Visit RockHer
  7. 17Ritani83 in stock
    United States·Founded 1999·GIA·Ships to United States
    Terms not yet verified
    Visit Ritani
  12. 22Zales43 in stock
    United States·Founded 1924·GIA·Ships to United States
    Terms not yet verified
    Visit Zales
  13. 23

    GemTrove

    41 in stock
    AU·GIA, HRD, IGI
    Terms not yet verified
  16. 26Jared40 in stock
    United States·Founded 1993·GIA·Ships to United States
    Terms not yet verified
    Visit Jared
  19. 29

    The Perfect Carat

    38 in stock
    US·GIA, IGI·Ships to United States
    Terms not yet verified
  25. 35GemsNY27 in stock
    United States·Founded 1988·GIA·Ships to United States
    Terms not yet verified
    Visit GemsNY
  33. 43Shane Co9 in stock
    United States·Founded 1971·GIA, GSI·Ships to United States
    Terms not yet verified
    Visit Shane Co
  36. 46ZCOVA6 in stock
    Malaysia·Founded 2015·GIA·Ships to United States
    Terms not yet verified
    Visit ZCOVA
  44. 54NZ Jewellers2 in stock
    New Zealand·Founded 2006·IGI·30-day returns·Ships to United States
    Terms read on the retailer’s own site, October 19, 2026
    Visit NZ Jewellers
  48. 58

    Victor Canera

    1 in stock
    US·Ships to United States
    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 3,145 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 1ct natural cushion diamond, all grades

How pricing is spread at this spec

For the 811 diamonds at this spec with a recently confirmed price, each taken at its cheapest confirmed price, the distribution looks like this:

  • Lowest confirmed
    $825
  • 10th percentile
    $1,107
  • Median
    $1,824
  • 75th percentile
    $2,723
  • 90th percentile
    $3,457
  • Highest confirmed
    $6,278

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 $1,107. Use the explorer to sort by price.

Sort by price

Best cut quality for the spec?

698 of 3,145 active listings carry Excellent or Ideal across cut, polish and symmetry.

View top-cut subset

GIA-graded only?

2,744 of 3,145 (87%) carry GIA. 52 retailers stock GIA at this spec.

Want None or Faint fluorescence?

2,876 of 3,145 are graded None or Faint at this spec.

Shopping from United States?

49 of the 56 retailers with shipping details ship to United States. 7 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 color: near-colorless, 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 1ct I SI1 cushion natural diamonds.

Compare Yorxs vs MOH London

Related specs

Slightly smaller carat

cushion-0-75ct-i-si1-natural

Slightly larger carat

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

One colour grade higher

cushion-1ct-h-si1-natural

One colour grade lower

cushion-1ct-j-si1-natural

One clarity grade higher

cushion-1ct-i-vs2-natural

One clarity grade lower

cushion-1ct-i-si2-natural

Same spec, lab grown

cushion-1ct-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 1ct I SI1 Cushion Natural Diamonds | Carat Hunter