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Cushion|Lab Grown|IGI

1.50ct E SI1 Cushion Lab Grown Diamond

ID • E/SI1 • IGI LG523299010

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG523299010

Diamond specifications and retailer prices

From £154 GBP
As of November 6, 2026
Save £701 GBP (82%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £855 GBP at Reve Diamonds · As of November 6, 2026
View at Reve Diamonds

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 LG523299010 or 523299010. Listed at 15 retailers as of November 6, 2026, with prices from £154 to £855, a £701 spread on the same certified stone. Reve Diamonds lists it at £855. 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 angle36.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG523299010
Dimensions6.60 × 6.36 × 4.22 mm
L/W Ratio1.04
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
6.60 mm6.36 mm1.50 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG523299010
Side View
Table 63.0%Crown 33.7°Girdle: MED-THKPavilion 36.9°Culet: NoneDepth 66.4%

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 6
Current: £393 GBP|Low: £154 GBP|High: £964 GBP|Avg: £405 GBP
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 7, 2026
Retailer 3£154 GBP
Retailer 12£171 GBP
Retailer 11£232 GBP
Retailer 7£280 GBP
Retailer 6£306 GBP
Retailer 4£340 GBP
Retailer 1£393 GBP
Retailer 9£407 GBP
Retailer 2£420 GBP
Retailer 5£635 GBP
Retailer 8£799 GBP
Retailer 10£829 GBP

44 data points across 12 retailers

15 retailers£154 GBP to £855 GBP

A
Cheapest Retailer
-
£154 GBP
Final sale: no returns
A
Retailer 2
-
£171 GBP
View
B+
Retailer 3
-
£232 GBP
View
A
Retailer 4
-
£280 GBP
View
A
Retailer 5
-
£306 GBP
View
A
Retailer 6
-
£332 GBP
View
A
Retailer 7
-
£340 GBP
View
A
Retailer 8
-
£393 GBP
View
A
Retailer 9
-
£407 GBP
View
B+
Retailer 10
-
£420 GBP
View
B
Retailer 11
-
£590 GBP
View
B+
Retailer 12
-
£635 GBP
View
B
Retailer 13
-
£799 GBP
View
B
Retailer 14
-
£829 GBP
View
Most Expensive
B
Reve Diamonds
CF8011C43 · Nov 6
£855 GBP
$1,145 USD
View
14 more retailers have this diamond
Prices start from £154 GBPSave up to £701 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
£154 GBP