CaratHunter
Plans
Cushion|Lab Grown|IGI

3.51ct H SI1 Cushion Lab Grown Diamond

ID • H/SI1 • IGI LG788640233

Shape and cutting style on the report: Cushion brilliant

Certificate IGI LG788640233

Diamond specifications and retailer prices

From £515 GBP
As of November 6, 2026
Save £1,957 GBP (79%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £2,472 GBP at MOH London · As of November 5, 2026
View at MOH London

About this 3.51ct lab-grown cushion diamond

This 3.51ct lab-grown cushion sits in the three to five carat band, graded H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG788640233 or 788640233. Listed at 10 retailers as of November 5, 2026, with prices from £515 to £2,472, a £1,957 spread on the same certified stone. MOH London lists it at £2,472. 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

3.51
Carat
H
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.3°
Pavilion angle37.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG788640233
Dimensions11.23 × 7.91 × 4.82 mm
L/W Ratio1.42
Girdle conditionFaceted
Culet sizeLarge
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
11.23 mm7.91 mm3.51 ctH / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG788640233
Side View
Table 63.0%Crown 33.3°Girdle: THK-VTKPavilion 37.9°Culet: LargeDepth 60.9%

Caratlytics Score

How it works →
A
Excellent
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 6
Current: £2,472 GBP|Low: £515 GBP|High: £3,168 GBP|Avg: £1,220 GBP|+0.1%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 6, 2026
Retailer 9£515 GBP
Retailer 7£571 GBP
Retailer 3£657 GBP
Retailer 8£766 GBP
Retailer 6£842 GBP
Retailer 2£864 GBP
Retailer 5£1,130 GBP
Retailer 4£1,741 GBP
Retailer 10£1,844 GBP
MOH London£2,472 GBP

26 data points across 10 retailers

10 retailers£515 GBP to £2,472 GBP

A
Cheapest Retailer
-
£515 GBP
Final sale: no returns
Retailer 2
-
£571 GBP
View
Price last confirmed 22 days ago
A
Retailer 3
-
£657 GBP
View
B+
Retailer 4
-
£766 GBP
View
A
Retailer 5
-
£842 GBP
View
A
Retailer 6
-
£864 GBP
View
B+
Retailer 7
-
£1,130 GBP
View
B+
Retailer 8
-
£1,741 GBP
View
B
Retailer 9
-
£1,844 GBP
View
Most Expensive
B
MOH London
LG788640233 · Nov 5
£2,472 GBP
View
9 more retailers have this diamond
Prices start from £515 GBPSave up to £1,957 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
3.51ct Cushion
£515 GBP