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Cushion|Lab Grown|IGI

1.21ct D VS1 Cushion Lab Grown Diamond

VG • D/VS1 • IGI LG729540237

Certificate IGI LG729540237

Diamond specifications and retailer prices

From £528 GBP
$707 USD
As of October 31, 2026
Save £211 GBP (29%) vs most expensive(unlock to see where)
4 retailers carry this diamond
Most expensive: £739 GBP at Kay Jewelers · As of November 2, 2026
View at Kay Jewelers

About this 1.21ct lab-grown cushion diamond

This 1.21ct lab-grown cushion sits in the classic one-carat band, graded D colour (colourless) and VS1 clarity (very-slightly-included), with a very-good cut grade and certified by IGI LG729540237 or 729540237. Listed at 4 retailers as of October 31, 2026, with prices from £528 to £739, a £211 spread on the same certified stone. Kay Jewelers lists it at £739. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.21
Carat
D
Colour
VS1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginLab Grown
Grading LabIGI
CertificateIGI LG729540237
Dimensions7.67 × 5.72 × 3.81 mm
L/W Ratio1.34
Top View
7.67 mm5.72 mm1.21 ctD / VS1
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG729540237
Side View
Table 62.0%CrownGirdle: MED-THKPavilionCulet: NoneDepth 66.6%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 31
Current: £739 GBP|Low: £528 GBP|High: £851 GBP|Avg: £738 GBP|-13.2%
Kay Jewelers
Retailer 2
Retailer 3
Retailer 4
September 26, 2026
Retailer 2£528 GBP
Retailer 4£619 GBP
Kay Jewelers£739 GBP
Retailer 3£739 GBP

9 data points across 4 retailers

4 retailers£528 GBP to £739 GBP

B+
Cheapest Retailer
-
£528 GBP
$707 USD
B
Retailer 2
-
£619 GBP
$830 USD
View
B
Retailer 3
-
£739 GBP
$990 USD
View
Most Expensive
B
Kay Jewelers
257259695 · Nov 2
£739 GBP
$990 USD
View
3 more retailers have this diamond
Prices start from £528 GBPSave up to £211 GBP

Carat Hunter is not affiliated with, endorsed by, or sponsored by any retailer listed. Retailer information is from publicly available sources and may not be current. Verify details directly with the retailer before purchasing. Return terms as we hold them. Check the retailer's own returns page before you buy.

B+
1.21ct Cushion
£528 GBP