Where to buy a 1.25ct lab-grown cushion diamond

Half of these diamonds are listed between £193 and £511 (as of November 7, 2026).

Certificated stones with a recently confirmed price only, 2,873 of them. Each contributes its cheapest confirmed price.

As of November 7, 2026, the same certified diamond typically costs 44% more at a typical retailer than at the cheapest for lab-grown stones, and 21% more for natural ones (the median across stones listed by two or more retailers). Comparing shows you the cheapest of the retailers listing the same stone.

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

1. 1Rare Carat1,504 in stock

   United States·Founded 2016·GCAL, GIA, IGI·30-day returns·Ships to United Kingdom

   Terms read on the retailer’s own site, October 19, 2026

   Visit Rare Carat
2. 2Loose Grown Diamond1,493 in stock

   United States·Founded 2018·GCAL, GIA, IGI

   Terms not yet verified

   Visit Loose Grown Diamond
3. 3MOH London1,399 in stock

   United Kingdom·GCAL, GIA, GSI, HRD·Ships to United Kingdom

   Terms not yet verified

   Visit MOH London
4. 477 Diamonds1,234 in stock

   United Kingdom·Founded 2005·GCAL, GIA, HRD, IGI·Ships to United Kingdom

   Terms not yet verified

   Visit 77 Diamonds
5. 5Diamond Quarter1,136 in stock

   United Kingdom·GCAL, GIA, HRD, IGI·Ships to United Kingdom

   Terms not yet verified

   Visit Diamond Quarter
6. 6Adiamor1,127 in stock

   United States·Founded 1999·GCAL, GIA, IGI

   Terms not yet verified

   Visit Adiamor
7. 7B2C Jewels1,082 in stock

   United States·Founded 2004·GIA, IGI·30-day returns·Ships to United Kingdom

   Terms read on the retailer’s own site, October 19, 2026

   Visit B2C Jewels
8. 8Taylor and Hart1,070 in stock

   United Kingdom·Founded 2013·GCAL, GIA, IGI·Ships to United Kingdom

   Terms not yet verified

   Visit Taylor and Hart
9. 9William & Sons Jewelers1,034 in stock

   United States·GCAL, GIA, GSI, HRD·Final sale: no returns

   Terms read on the retailer’s own site, October 19, 2026

   Visit William & Sons Jewelers
10. 10Aida Diamonds950 in stock

    Australia·GIA, IGI

    Terms not yet verified

    Visit Aida Diamonds

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.

36 of the 58 retailers with shipping details ship to United Kingdom. 22 do not. 15 retailers have not published any shipping details.

Each combination below has its own page with the retailers that stock exactly that grade.

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

• 1.21ct D VVS2from $190 across 13 retailersAs of November 6, 2026
• 1.22ct D VVS2from $189 across 14 retailersAs of November 6, 2026
• 1.26ct D VS1from $218 across 15 retailersAs of November 6, 2026
• 1.27ct D VS1from $220 across 15 retailersAs of November 6, 2026
• 1.21ct E VVS2from $188 across 15 retailersAs of November 7, 2026
• 1.24ct E VVS2from $200 across 14 retailersAs of November 6, 2026

• Cushion: a softened-corner square or rectangle with a vintage feel.
• Lab-grown: chemically identical to natural diamonds, typically at least 90% less than a comparable natural cohort from 1 carat up.