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Cushion|Lab Grown|IGI

1.51ct H SI1 Cushion Lab Grown Diamond

GD • H/SI1 • IGI LG526259531

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG526259531

Diamond specifications and retailer prices

From £229 GBP
$307 USD
As of November 1, 2026
Save £787 GBP (77%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: £1,016 GBP at MOH London · As of November 1, 2026
View at MOH London

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 H colour (near-colourless) and SI1 clarity (slightly-included), with a standard cut grade and certified by IGI LG526259531 or 526259531. Listed at 9 retailers as of November 1, 2026, with prices from £229 to £1,016, a £787 spread on the same certified stone. MOH London lists it at £1,016. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.51
Carat
H
Colour
SI1
Clarity
Good
Cut

Specifications

CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.9°
Pavilion angle40.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG526259531
Dimensions7.33 × 7.14 × 4.32 mm
L/W Ratio1.03
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process and may include post-growth treatment Type IIa
Top View
7.33 mm7.14 mm1.51 ctH / SI1
OriginLab Grown
CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG526259531
Side View
Table 63.5%Crown 33.9°Girdle: THN-MEDPavilion 40.9°Culet: NoneDepth 60.5%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 1
Current: £1,016 GBP|Low: £163 GBP|High: £1,028 GBP|Avg: £510 GBP|-1.0%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 1, 2026
Retailer 7£229 GBP
Retailer 4£254 GBP
Retailer 9£361 GBP
Retailer 3£362 GBP
Retailer 6£419 GBP
Retailer 8£505 GBP
Retailer 10£515 GBP
Retailer 2£590 GBP
Retailer 5£724 GBP
MOH London£1,016 GBP

14 data points across 10 retailers

9 retailers£229 GBP to £1,016 GBP

B+
Cheapest Retailer
-
£229 GBP
$307 USD
Final sale: no returns
Retailer 2
-
£254 GBP
$340 USD
View
Price last confirmed 24 days ago
B+
Retailer 3
-
£361 GBP
$484 USD
View
B+
Retailer 4
-
£362 GBP
$485 USD
View
B+
Retailer 5
-
£419 GBP
$562 USD
View
B+
Retailer 6
-
£505 GBP
$676 USD
View
B+
Retailer 7
-
£590 GBP
$790 USD
View
B
Retailer 8
-
£724 GBP
$970 USD
View
Most Expensive
B
MOH London
LG526259531 · Nov 1
£1,016 GBP
View
8 more retailers have this diamond
Prices start from £229 GBPSave up to £787 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.

B+
1.51ct Cushion
£229 GBP