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Cushion|Lab Grown|IGI

1.50ct F SI1 Cushion Lab Grown Diamond

ID • F/SI1 • IGI LG522251870

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG522251870

Diamond specifications and retailer prices

From £154 GBP
As of November 5, 2026
Save £701 GBP (82%) vs most expensive(unlock to see where)
13 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 F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG522251870 or 522251870. Listed at 13 retailers as of November 5, 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
F
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.6°
Pavilion angle33.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG522251870
Dimensions6.62 × 6.47 × 4.11 mm
L/W Ratio1.02
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
6.62 mm6.47 mm1.50 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG522251870
Side View
Table 64.5%Crown 36.6°Girdle: MED-VTKPavilion 33.6°Culet: NoneDepth 63.5%

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 5
Current: £291 GBP|Low: £152 GBP|High: £855 GBP|Avg: £395 GBP|+4.0%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Reve Diamonds
November 6, 2026
Retailer 8£154 GBP
Retailer 12£168 GBP
Retailer 2£238 GBP
Retailer 1£291 GBP
Retailer 6£305 GBP
Retailer 5£338 GBP
Retailer 4£351 GBP
Retailer 3£418 GBP
Retailer 11£420 GBP
Retailer 10£589 GBP
Retailer 7£687 GBP
Retailer 9£796 GBP
Reve Diamonds£855 GBP

36 data points across 13 retailers

13 retailers£154 GBP to £855 GBP

A
Cheapest Retailer
-
£154 GBP
Final sale: no returns
Retailer 2
-
£168 GBP
View
Price last confirmed 26 days ago
B+
Retailer 3
-
£238 GBP
View
A
Retailer 4
-
£291 GBP
View
A
Retailer 5
-
£305 GBP
View
A
Retailer 6
-
£338 GBP
View
A
Retailer 7
-
£351 GBP
View
A
Retailer 8
-
£418 GBP
View
A
Retailer 9
-
£420 GBP
View
B+
Retailer 10
-
£589 GBP
View
B
Retailer 11
-
£687 GBP
View
B
Retailer 12
-
£796 GBP
View
Most Expensive
B
Reve Diamonds
1116C6968 · Nov 6
£855 GBP
$1,144 USD
View
12 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