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Cushion|Lab Grown|IGI

1.31ct D IF Cushion Lab Grown Diamond

EX • D/IF • IGI LG776609771

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG776609771

Diamond specifications and retailer prices

From £427 GBP
As of November 4, 2026
Save £1,610 GBP (79%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: £2,037 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 LG776609771 or 776609771. Listed at 18 retailers as of November 4, 2026, with prices from £427 to £2,037, a £1,610 spread on the same certified stone. Brilliant Earth lists it at £2,037. 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 angle35.1°
Pavilion angle41.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG776609771
Dimensions7.51 × 5.71 × 3.94 mm
L/W Ratio1.32
Girdle conditionFaceted
Culet sizePointed
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
7.51 mm5.71 mm1.31 ctD / IF
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG776609771
Side View
Table 60.0%Crown 35.1°Girdle: MED-STKPavilion 41.3°Culet: NoneDepth 69.0%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 4
Current: £2,037 GBP|Low: £427 GBP|High: £2,222 GBP|Avg: £1,092 GBP|-5.5%
Brilliant Earth
Retailer 2
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Retailer 11
Retailer 12
Retailer 13
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Retailer 18
November 4, 2026
Retailer 18£427 GBP
Retailer 10£499 GBP
Retailer 17£521 GBP
Retailer 11£574 GBP
Retailer 4£631 GBP
Retailer 15£721 GBP
Retailer 5£722 GBP
Retailer 2£726 GBP
Retailer 7£734 GBP
Retailer 12£816 GBP
Retailer 16£1,153 GBP
Retailer 13£1,363 GBP
Retailer 3£1,377 GBP
Retailer 9£1,499 GBP
Retailer 6£1,539 GBP
Retailer 8£1,629 GBP
Retailer 14£1,976 GBP
Brilliant Earth£2,037 GBP

41 data points across 18 retailers

18 retailers£427 GBP to £2,037 GBP

A
Cheapest Retailer
-
£427 GBP
Final sale: no returns
Retailer 2
-
£499 GBP
View
Price last confirmed 19 days ago
A
Retailer 3
-
£521 GBP
View
A
Retailer 4
-
£574 GBP
View
A
Retailer 5
-
£631 GBP
View
A
Retailer 6
-
£721 GBP
View
A
Retailer 7
-
£722 GBP
View
A
Retailer 8
-
£726 GBP
View
A
Retailer 9
-
£734 GBP
View
A
Retailer 10
-
£816 GBP
View
B+
Retailer 11
-
£1,153 GBP
View
B+
Retailer 12
-
£1,363 GBP
View
B
Retailer 13
-
£1,377 GBP
View
B
Retailer 14
-
£1,499 GBP
View
B
Retailer 15
-
£1,539 GBP
View
B
Retailer 16
-
£1,629 GBP
View
B
Retailer 17
-
£1,976 GBP
View
Most Expensive
B
Brilliant Earth
19077250A · Nov 4
£2,037 GBP
$2,750 USD
View
17 more retailers have this diamond
Prices start from £427 GBPSave up to £1,610 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
£427 GBP