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Cushion|Lab Grown|IGI

1.31ct E SI1 Cushion Lab Grown Diamond

EX • E/SI1 • IGI LG694550465

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

Certificate IGI LG694550465

Diamond specifications and retailer prices

From £155 GBP
As of November 6, 2026
Save £659 GBP (81%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £814 GBP at Brilliant Earth · As of November 6, 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 E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG694550465 or 694550465. Listed at 13 retailers as of November 6, 2026, with prices from £155 to £814, a £659 spread on the same certified stone. Brilliant Earth lists it at £814. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

1.31
Carat
E
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle38.9°
Pavilion angle38.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG694550465
Dimensions6.44 × 6.23 × 4.20 mm
L/W Ratio1.03
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
6.44 mm6.23 mm1.31 ctE / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG694550465
Side View
Table 63.0%Crown 38.9°Girdle: MED-STKPavilion 38.8°Culet: NoneDepth 67.4%

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 6
Current: £814 GBP|Low: £155 GBP|High: £867 GBP|Avg: £427 GBP|-2.7%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 9£155 GBP
Retailer 8£172 GBP
Retailer 11£232 GBP
Retailer 4£306 GBP
Retailer 2£315 GBP
Retailer 10£343 GBP
Retailer 7£422 GBP
Retailer 6£512 GBP
Retailer 3£592 GBP
Retailer 5£800 GBP
Brilliant Earth£814 GBP

43 data points across 11 retailers

13 retailers£155 GBP to £814 GBP

A
Cheapest Retailer
-
£155 GBP
Final sale: no returns
Retailer 2
-
£172 GBP
View
Price last confirmed 12 days ago
B+
Retailer 3
-
£232 GBP
View
A
Retailer 4
-
£306 GBP
View
A
Retailer 5
-
£315 GBP
View
A
Retailer 6
-
£343 GBP
View
B+
Retailer 7
-
£422 GBP
View
B+
Retailer 8
-
£508 GBP
View
Retailer 9
-
£511 GBP
View
Price last confirmed 89 days ago
B+
Retailer 10
-
£512 GBP
View
B
Retailer 11
-
£592 GBP
View
B
Retailer 12
-
£800 GBP
View
Most Expensive
B
Brilliant Earth
21312327A · Nov 6
£814 GBP
$1,090 USD
View
12 more retailers have this diamond
Prices start from £155 GBPSave up to £659 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
£155 GBP