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Carat Hunter · Where to buy diamonds

3ct · G · 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

282

Retailers carrying

35

Price range

$372 to
$4,915

Median confirmed price

$1,250

Certificate mix:IGI 207 · GIA 43 · GCAL 15

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 Jewels20 in stock
    United States·Founded 2004·GIA, IGI·30-day returns·Ships to United States
    Terms read on the retailer’s own site, October 19, 2026
    Visit B2C Jewels
  10. 10RockHer14 in stock
    United States·Founded 2016·GIA, IGI·Ships to United States
    Terms not yet verified
    Visit RockHer
Show 25 more retailers
  1. 11Adiamor12 in stock
    United States·Founded 1999·GCAL, GIA, IGI·Ships to United States
    Terms not yet verified
    Visit Adiamor
  2. 12Allurez11 in stock
    United States·Founded 2010·Ships to United States
    Terms not yet verified
    Visit Allurez
  3. 13Rare Carat9 in stock
    United States·Founded 2016·IGI·30-day returns·Ships to United States
    Terms read on the retailer’s own site, October 19, 2026
    Visit Rare Carat
  13. 23GemsNY3 in stock
    United States·Founded 1988·GCAL, GIA, IGI·Ships to United States
    Terms not yet verified
    Visit GemsNY
  14. 24Jared3 in stock
    United States·Founded 1993·GIA·Ships to United States
    Terms not yet verified
    Visit Jared
  17. 27Yorxs3 in stock
    Germany·Founded 2011·GIA, IGI
    Terms not yet verified
    Visit Yorxs
  20. 30Zales2 in stock
    United States·Founded 1924·GIA·Ships to United States
    Terms not yet verified
    Visit Zales

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 282 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 3ct lab grown cushion diamond, all grades

How pricing is spread at this spec

For the 86 diamonds at this spec with a recently confirmed price, each taken at its cheapest confirmed price, the distribution looks like this:

  • Lowest confirmed
    $372
  • 10th percentile
    $623
  • Median
    $1,250
  • 75th percentile
    $2,018
  • 90th percentile
    $2,639
  • Highest confirmed
    $4,915

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 $623. Use the explorer to sort by price.

Sort by price

Best cut quality for the spec?

158 of 282 active listings carry Excellent or Ideal across cut, polish and symmetry.

View top-cut subset

GIA-graded only?

43 of 282 (15%) carry GIA. 27 retailers stock GIA at this spec.

Want None or Faint fluorescence?

264 of 282 are graded None or Faint at this spec.

Shopping from United States?

28 of the 34 retailers with shipping details ship to United States. 6 do not. 1 retailer has not published any shipping details.

What this spec means

  • Cushion: a softened-corner square or rectangle with a vintage feel.
  • G color: near-colorless, one step below the D to F band, with virtually no perceptible color to most buyers.
  • 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 3ct G SI1 cushion lab grown diamonds.

Compare Diamond Quarter vs B2C Jewels

Related specs

Slightly smaller carat

cushion-2ct-g-si1-lab

One colour grade higher

cushion-3ct-f-si1-lab

One colour grade lower

cushion-3ct-h-si1-lab

One clarity grade higher

cushion-3ct-g-vs2-lab

One clarity grade lower

cushion-3ct-g-si2-lab

Same spec, natural

cushion-3ct-g-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.