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Cushion|Lab Grown|IGI

1.51ct D IF Cushion Lab Grown Diamond

ID • D/IF • IGI LG843667687

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG843667687

Diamond specifications and retailer prices

From £387 GBP
As of November 4, 2026
Save £1,991 GBP (84%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £3,252 GBP at Brilliant Earth · As of October 15, 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 D colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG843667687 or 843667687. Listed at 13 retailers as of November 4, 2026, with a 515% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.51
Carat
D
Colour
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.2°
Pavilion angle32.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG843667687
Dimensions8.82 × 5.59 × 3.79 mm
L/W Ratio1.58
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
8.82 mm5.59 mm1.51 ctD / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG843667687
Side View
Table 58.0%Crown 33.2°Girdle: STK-VTKPavilion 32.1°Culet: NoneDepth 67.8%

Caratlytics Score

How it works →
A+
Exceptional
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 4
Current: £2,096 GBP|Low: £387 GBP|High: £2,941 GBP|Avg: £1,193 GBP
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 5, 2026
Retailer 6£387 GBP
Retailer 9£478 GBP
Retailer 11£531 GBP
Retailer 7£598 GBP
Retailer 12£607 GBP
Retailer 5£854 GBP
Retailer 2£1,427 GBP
Retailer 4£1,666 GBP
Retailer 8£1,795 GBP
Retailer 3£1,863 GBP
Brilliant Earth£2,096 GBP
Retailer 10£2,378 GBP

22 data points across 12 retailers

13 retailers£387 GBP to £2,378 GBP

A+
Cheapest Retailer
-
£387 GBP
A
Retailer 2
-
£478 GBP
View
A
Retailer 3
-
£531 GBP
View
A
Retailer 4
-
£598 GBP
View
A
Retailer 5
-
£607 GBP
View
A
Retailer 6
-
£854 GBP
View
B+
Retailer 7
-
£1,427 GBP
View
Retailer 8
-
£1,666 GBP
View
Price last confirmed 20 days ago
B
Retailer 9
-
£1,795 GBP
View
Retailer 10
-
£1,863 GBP
View
Price last confirmed 17 days ago
B+
Retailer 11
-
£2,096 GBP
View
B
Retailer 12
-
£2,378 GBP
View
Most Expensive
Brilliant Earth
21768659A · Oct 15
£3,252 GBP
$4,390 USD
View
Price last confirmed 20 days ago
12 more retailers have this diamond
Prices start from £387 GBPSave up to £1,991 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
£387 GBP