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Cushion|Lab Grown|IGI

1.31ct D IF Cushion Lab Grown Diamond

EX • D/IF • IGI LG841632427

Shape and cutting style on the report: Square cushion modified brilliant

Certificate IGI LG841632427

Diamond specifications and retailer prices

From £525 GBP
As of November 2, 2026
Save £993 GBP (65%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: £1,519 GBP at Brilliant Earth · As of November 4, 2026
View at Brilliant Earth

About this 1.31ct lab-grown cushion diamond

This 1.31ct lab-grown cushion sits in the one-and-a-quarter to one-and-a-half carat band, graded D colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG841632427 or 841632427. Listed at 7 retailers as of November 2, 2026, with prices from £525 to £1,519, a £993 spread on the same certified stone. Brilliant Earth lists it at £1,519. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.31
Carat
D
Colour
IF
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle32.6°
Pavilion angle39.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG841632427
Dimensions6.54 × 6.40 × 4.13 mm
L/W Ratio1.02
Girdle conditionFaceted
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
6.54 mm6.40 mm1.31 ctD / IF
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG841632427
Side View
Table 63.0%Crown 32.6°Girdle: MED-STKPavilion 39.1°Culet: NoneDepth 64.5%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 2
Current: £1,519 GBP|Low: £525 GBP|High: £1,519 GBP|Avg: £965 GBP
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 3, 2026
Retailer 7£525 GBP
Retailer 2£713 GBP
Retailer 6£1,019 GBP
Retailer 5£1,046 GBP
Retailer 3£1,278 GBP
Retailer 4£1,403 GBP
Brilliant Earth£1,519 GBP

8 data points across 7 retailers

7 retailers£525 GBP to £1,519 GBP

A
Cheapest Retailer
-
£525 GBP
A
Retailer 2
-
£713 GBP
View
Retailer 3
-
£1,019 GBP
View
Price last confirmed 13 days ago
B+
Retailer 4
-
£1,046 GBP
View
B+
Retailer 5
-
£1,278 GBP
View
B
Retailer 6
-
£1,403 GBP
View
Most Expensive
B
Brilliant Earth
22472567Y · Nov 4
£1,519 GBP
$2,050 USD
View
6 more retailers have this diamond
Prices start from £525 GBPSave up to £993 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.

A
1.31ct Cushion
£525 GBP