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Cushion|Lab Grown|IGI

2.50ct E SI1 Cushion Lab Grown Diamond

ID • E/SI1 • IGI LG613392731

Shape and cutting style on the report: Cushion brilliant

Certificate IGI LG613392731

Diamond specifications and retailer prices

From £316 GBP
$424 USD
As of October 30, 2026
Save £1,482 GBP (82%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £1,799 GBP at Brilliant Earth · As of October 29, 2026
View at Brilliant Earth

About this 2.5ct lab-grown cushion diamond

This 2.5ct lab-grown cushion sits in the two to three carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG613392731 or 613392731. Listed at 11 retailers as of October 29, 2026, with prices from £316 to £1,799, a £1,482 spread on the same certified stone. Brilliant Earth lists it at £1,799. 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

2.50
Carat
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.7°
Pavilion angle40.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG613392731
Dimensions8.71 × 7.38 × 5.20 mm
L/W Ratio1.18
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process and may include post-growth treatment Type IIa
Top View
8.71 mm7.38 mm2.50 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG613392731
Side View
Table 63.0%Crown 33.7°Girdle: MED-STKPavilion 40.1°Culet: NoneDepth 70.5%

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: Oct 30
Current: £1,799 GBP|Low: £316 GBP|High: £1,851 GBP|Avg: £764 GBP|-2.8%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
October 30, 2026
Retailer 9£316 GBP
Retailer 6£351 GBP
Retailer 5£448 GBP
Retailer 7£558 GBP
Retailer 3£566 GBP
Retailer 8£619 GBP
Retailer 2£634 GBP
Retailer 4£1,377 GBP
Brilliant Earth£1,799 GBP

41 data points across 9 retailers

11 retailers£316 GBP to £1,799 GBP

A
Cheapest Retailer
-
£316 GBP
$424 USD
Final sale: no returns
A
Retailer 2
-
£351 GBP
$470 USD
View
A
Retailer 3
-
£448 GBP
$600 USD
View
B+
Retailer 4
-
£558 GBP
$748 USD
View
A
Retailer 5
-
£566 GBP
€722 EUR
View
B+
Retailer 6
-
£606 GBP
$812 USD
View
B+
Retailer 7
-
£619 GBP
$829 USD
View
B+
Retailer 8
-
£634 GBP
View
B
Retailer 9
-
£1,156 GBP
$1,549 USD
View
B
Retailer 10
-
£1,377 GBP
View
Most Expensive
B
Brilliant Earth
8815295A · Oct 29
£1,799 GBP
$2,410 USD
View
10 more retailers have this diamond
Prices start from £316 GBPSave up to £1,482 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
2.50ct Cushion
£316 GBP