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Cushion|Lab Grown|IGI

1.50ct D SI1 Cushion Lab Grown Diamond

ID • D/SI1 • IGI LG775629456

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

Certificate IGI LG775629456

Diamond specifications and retailer prices

From £149 GBP
$199 USD
As of October 30, 2026
Save £695 GBP (82%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £843 GBP at Brilliant Earth · As of October 31, 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 D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG775629456 or 775629456. Listed at 12 retailers as of October 30, 2026, with prices from £149 to £843, a £695 spread on the same certified stone. Brilliant Earth lists it at £843. 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
D
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryVery Good
FluorescenceNone
Crown angle32.1°
Pavilion angle34.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG775629456
Dimensions6.71 × 6.60 × 4.07 mm
L/W Ratio1.02
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
6.71 mm6.60 mm1.50 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateIGI LG775629456
Side View
Table 65.0%Crown 32.1°Girdle: MED-STKPavilion 34.6°Culet: NoneDepth 61.7%

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: £843 GBP|Low: £149 GBP|High: £940 GBP|Avg: £403 GBP|-9.6%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 1, 2026
Retailer 9£149 GBP
Retailer 3£175 GBP
Retailer 10£292 GBP
Retailer 2£295 GBP
Retailer 5£305 GBP
Retailer 4£306 GBP
Retailer 7£357 GBP
Retailer 8£358 GBP
Retailer 6£413 GBP
Retailer 11£569 GBP
Retailer 12£821 GBP
Brilliant Earth£843 GBP

45 data points across 12 retailers

12 retailers£149 GBP to £843 GBP

A
Cheapest Retailer
-
£149 GBP
$199 USD
Final sale: no returns
A
Retailer 2
-
£175 GBP
$234 USD
View
B+
Retailer 3
-
£292 GBP
$391 USD
View
A
Retailer 4
-
£295 GBP
View
A
Retailer 5
-
£305 GBP
€389 EUR
View
Retailer 6
-
£306 GBP
View
Price last confirmed 18 days ago
A
Retailer 7
-
£357 GBP
$478 USD
View
A
Retailer 8
-
£358 GBP
$480 USD
View
B+
Retailer 9
-
£413 GBP
$553 USD
View
B+
Retailer 10
-
£569 GBP
$762 USD
View
B
Retailer 11
-
£821 GBP
View
Most Expensive
B
Brilliant Earth
17807477A · Oct 31
£843 GBP
$1,130 USD
View
11 more retailers have this diamond
Prices start from £149 GBPSave up to £695 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