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Cushion|Lab Grown|IGI

2.57ct E SI1 Cushion Lab Grown Diamond

ID • E/SI1 • IGI LG705535137

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

Certificate IGI LG705535137

Diamond specifications and retailer prices

From £298 GBP
HK$3,100 HKD
As of October 30, 2026
Save £967 GBP (76%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £1,711 GBP at Rare Carat
View at Rare Carat

About this 2.57ct lab-grown cushion diamond

This 2.57ct 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 LG705535137 or 705535137. Listed at 10 retailers as of October 28, 2026, with a 325% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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

2.57
Carat
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.3°
Pavilion angle39.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG705535137
Dimensions8.01 × 7.95 × 5.29 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
8.01 mm7.95 mm2.57 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG705535137
Side View
Table 63.0%Crown 36.3°Girdle: MED-STKPavilion 39.8°Culet: NoneDepth 66.5%

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: Oct 30
Current: £1,711 GBP|Low: £298 GBP|High: £2,763 GBP|Avg: £1,016 GBP
Rare Carat
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
October 30, 2026
Retailer 10£298 GBP
Retailer 2£334 GBP
Retailer 7£383 GBP
Retailer 12£437 GBP
Retailer 6£468 GBP
Retailer 9£493 GBP
Retailer 13£591 GBP
Retailer 11£614 GBP
Retailer 8£1,070 GBP
Retailer 3£1,289 GBP
Rare Carat£1,711 GBP
Retailer 4£2,391 GBP
Retailer 5£2,763 GBP

3 data points across 13 retailers

10 retailers£298 GBP to £1,265 GBP

A
Cheapest Retailer
-
£298 GBP
HK$3,100 HKD
A
Retailer 2
-
£334 GBP
View
A
Retailer 3
-
£383 GBP
$510 USD
View
B+
Retailer 4
-
£437 GBP
$582 USD
View
A
Retailer 5
-
£468 GBP
View
A
Retailer 6
-
£493 GBP
$657 USD
View
B+
Retailer 7
-
£614 GBP
$817 USD
View
B
Retailer 8
-
£1,070 GBP
View
B
Retailer 9
-
£1,265 GBP
$1,685 USD
View
Most Expensive
Rare Carat
1279800
£1,711 GBP
$2,278 USD
View
9 more retailers have this diamond
Prices start from £298 GBPSave up to £967 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
2.57ct Cushion
£298 GBP