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Cushion|Lab Grown|IGI

1.51ct D IF Cushion Lab Grown Diamond

EX • D/IF • IGI LG728533556

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

Certificate IGI LG728533556

Diamond specifications and retailer prices

From £383 GBP
As of November 4, 2026
Save £1,832 GBP (83%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: £2,215 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 D colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG728533556 or 728533556. Listed at 20 retailers as of November 4, 2026, with prices from £383 to £2,215, a £1,832 spread on the same certified stone. Brilliant Earth lists it at £2,215. 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
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34°
Pavilion angle33.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG728533556
Dimensions6.54 × 6.41 × 4.14 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
6.54 mm6.41 mm1.51 ctD / IF
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG728533556
Side View
Table 59.0%Crown 34°Girdle: MED-THKPavilion 33.6°Culet: NoneDepth 64.6%

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: £2,215 GBP|Low: £383 GBP|High: £3,252 GBP|Avg: £1,182 GBP|-31.9%
Brilliant Earth
Retailer 2
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Retailer 19
November 5, 2026
Retailer 18£383 GBP
Retailer 9£465 GBP
Retailer 8£537 GBP
Retailer 3£569 GBP
Retailer 5£644 GBP
Retailer 10£685 GBP
Retailer 13£696 GBP
Retailer 16£731 GBP
Retailer 17£790 GBP
Retailer 2£990 GBP
Retailer 15£992 GBP
Retailer 14£1,077 GBP
Retailer 6£1,311 GBP
Retailer 19£1,386 GBP
Retailer 4£1,503 GBP
Retailer 11£1,535 GBP
Retailer 12£1,554 GBP
Retailer 7£1,795 GBP
Brilliant Earth£2,215 GBP

37 data points across 19 retailers

20 retailers£383 GBP to £2,215 GBP

A
Cheapest Retailer
-
£383 GBP
Final sale: no returns
Retailer 2
-
£465 GBP
View
Price last confirmed 20 days ago
A
Retailer 3
-
£537 GBP
View
A
Retailer 4
-
£569 GBP
View
A
Retailer 5
-
£644 GBP
View
A
Retailer 6
-
£685 GBP
View
A
Retailer 7
-
£696 GBP
View
A
Retailer 8
-
£731 GBP
View
A
Retailer 9
-
£790 GBP
View
A
Retailer 10
-
£990 GBP
View
A
Retailer 11
-
£992 GBP
View
B+
Retailer 12
-
£1,077 GBP
View
B+
Retailer 13
-
£1,311 GBP
View
B+
Retailer 14
-
£1,386 GBP
View
B+
Retailer 15
-
£1,503 GBP
View
Retailer 16
-
£1,535 GBP
View
Price last confirmed 25 days ago
B+
Retailer 17
-
£1,554 GBP
View
B
Retailer 18
-
£1,795 GBP
View
Retailer 19
-
£2,107 GBP
View
Price last confirmed 9 days ago
Most Expensive
B
Brilliant Earth
15509665A · Nov 4
£2,215 GBP
$2,990 USD
View
19 more retailers have this diamond
Prices start from £383 GBPSave up to £1,832 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
£383 GBP