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Cushion|Lab Grown|IGI

1.50ct E SI1 Cushion Lab Grown Diamond

ID • E/SI1 • IGI LG648477549

Shape and cutting style on the report: Cushion brilliant

Certificate IGI LG648477549

Diamond specifications and retailer prices

From £149 GBP
As of November 7, 2026
Save £405 GBP (73%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £941 GBP at Brilliant Earth · As of October 15, 2026
View at Brilliant Earth

About this 1.5ct lab-grown cushion diamond

This 1.5ct lab-grown cushion sits in the one-and-a-half to two carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG648477549 or 648477549. Listed at 10 retailers as of November 7, 2026, with a 271% 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

1.50
Carat
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.7°
Pavilion angle43.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG648477549
Dimensions7.73 × 6.25 × 4.22 mm
L/W Ratio1.24
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
7.73 mm6.25 mm1.50 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG648477549
Side View
Table 62.0%Crown 33.7°Girdle: THN-STKPavilion 43.5°Culet: NoneDepth 67.5%

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 7
Current: £941 GBP|Low: £149 GBP|High: £994 GBP|Avg: £410 GBP|-3.1%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
November 7, 2026
Retailer 6£149 GBP
Retailer 8£191 GBP
Retailer 9£261 GBP
Retailer 10£270 GBP
Retailer 3£270 GBP
Retailer 12£273 GBP
Retailer 4£326 GBP
Retailer 2£343 GBP
Retailer 5£345 GBP
Retailer 7£554 GBP
Retailer 13£635 GBP
Retailer 11£707 GBP
Brilliant Earth£941 GBP

24 data points across 13 retailers

10 retailers£149 GBP to £554 GBP

A
Cheapest Retailer
-
£149 GBP
A
Retailer 2
-
£191 GBP
View
A
Retailer 3
-
£261 GBP
View
A
Retailer 4
-
£270 GBP
View
B+
Retailer 5
-
£270 GBP
View
A
Retailer 6
-
£326 GBP
View
A
Retailer 7
-
£343 GBP
View
B+
Retailer 8
-
£554 GBP
View
Retailer 9
-
£635 GBP
View
Price last confirmed 27 days ago
Most Expensive
Brilliant Earth
13300652A · Oct 15
£941 GBP
$1,260 USD
View
Price last confirmed 22 days ago
9 more retailers have this diamond
Prices start from £149 GBPSave up to £405 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
1.50ct Cushion
£149 GBP