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Cushion|Lab Grown|IGI

1.51ct F IF Cushion Lab Grown Diamond

ID • F/IF • IGI LG825633151

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

Certificate IGI LG825633151

Diamond specifications and retailer prices

From £288 GBP
As of November 4, 2026
Save £1,363 GBP (83%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £1,651 GBP at Brilliant Earth · As of November 4, 2026
View at Brilliant Earth

About this 1.51ct lab-grown cushion diamond

This 1.51ct lab-grown cushion sits in the one-and-a-half to two carat band, graded F colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG825633151 or 825633151. Listed at 14 retailers as of November 4, 2026, with prices from £288 to £1,651, a £1,363 spread on the same certified stone. Brilliant Earth lists it at £1,651. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.51
Carat
F
Colour
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.1°
Pavilion angle42°
OriginLab Grown
Grading LabIGI
CertificateIGI LG825633151
Dimensions6.58 × 6.49 × 4.49 mm
L/W Ratio1.01
Girdle conditionFaceted
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
6.58 mm6.49 mm1.51 ctF / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG825633151
Side View
Table 65.0%Crown 35.1°Girdle: STK-THKPavilion 42°Culet: NoneDepth 69.2%

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 4
Current: £288 GBP|Low: £288 GBP|High: £1,360 GBP|Avg: £760 GBP|-0.5%
Retailer 1
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 4, 2026
Retailer 1£288 GBP
Retailer 12£375 GBP
Retailer 11£396 GBP
Retailer 9£483 GBP
Retailer 6£493 GBP
Retailer 8£495 GBP
Retailer 3£530 GBP
Retailer 7£657 GBP
Retailer 4£752 GBP
Retailer 5£937 GBP
Retailer 13£1,078 GBP
Retailer 10£1,124 GBP
Retailer 2£1,356 GBP

39 data points across 13 retailers

14 retailers£288 GBP to £1,651 GBP

A
Cheapest Retailer
-
£288 GBP
A
Retailer 2
-
£375 GBP
View
A
Retailer 3
-
£396 GBP
View
A
Retailer 4
-
£483 GBP
View
A
Retailer 5
-
£493 GBP
View
A
Retailer 6
-
£495 GBP
View
A
Retailer 7
-
£530 GBP
View
A
Retailer 8
-
£657 GBP
View
A
Retailer 9
-
£752 GBP
View
A
Retailer 10
-
£937 GBP
View
B+
Retailer 11
-
£1,078 GBP
View
A
Retailer 12
-
£1,124 GBP
View
Retailer 13
-
£1,356 GBP
View
Price last confirmed 17 days ago
Most Expensive
B+
Brilliant Earth
22411700A · Nov 4
£1,651 GBP
$2,210 USD
View
13 more retailers have this diamond
Prices start from £288 GBPSave up to £1,363 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
1.51ct Cushion
£288 GBP