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Cushion|Lab Grown|IGI

3.51ct E SI1 Cushion Lab Grown Diamond

EX • E/SI1 • IGI LG823696410

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG823696410

Diamond specifications and retailer prices

From £430 GBP
HK$4,500 HKD
As of October 30, 2026
Save £1,645 GBP (79%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £2,075 GBP at Brilliant Earth · As of October 30, 2026
View at Brilliant Earth

About this 3.51ct lab-grown cushion diamond

This 3.51ct lab-grown cushion sits in the three to five carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG823696410 or 823696410. Listed at 12 retailers as of October 30, 2026, with prices from £430 to £2,075, a £1,645 spread on the same certified stone. Brilliant Earth lists it at £2,075. 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
E
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.3°
Pavilion angle36.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG823696410
Dimensions10.54 × 7.56 × 5.12 mm
L/W Ratio1.39
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
10.54 mm7.56 mm3.51 ctE / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG823696410
Side View
Table 63.0%Crown 36.3°Girdle: MED-THKPavilion 36.4°Culet: NoneDepth 67.7%

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: Oct 30
Current: £2,075 GBP|Low: £363 GBP|High: £3,911 GBP|Avg: £1,155 GBP|-46.9%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
October 31, 2026
Retailer 5£363 GBP
Retailer 7£430 GBP
Retailer 10£496 GBP
Retailer 9£511 GBP
Retailer 8£612 GBP
Retailer 3£635 GBP
Retailer 11£662 GBP
Retailer 6£964 GBP
Retailer 4£1,014 GBP
Retailer 2£1,250 GBP
Retailer 12£1,484 GBP
Retailer 13£2,008 GBP
Brilliant Earth£2,075 GBP

41 data points across 13 retailers

12 retailers£430 GBP to £2,075 GBP

A
Cheapest Retailer
-
£430 GBP
HK$4,500 HKD
A
Retailer 2
-
£496 GBP
View
A
Retailer 3
-
£511 GBP
$685 USD
View
A
Retailer 4
-
£612 GBP
€781 EUR
View
B+
Retailer 5
-
£635 GBP
$851 USD
View
A
Retailer 6
-
£662 GBP
View
B+
Retailer 7
-
£964 GBP
$1,292 USD
View
B+
Retailer 8
-
£1,014 GBP
$1,359 USD
View
B+
Retailer 9
-
£1,250 GBP
SGD 2,263 SGD
View
B+
Retailer 10
-
£1,484 GBP
View
B
Retailer 11
-
£2,008 GBP
$2,690 USD
View
Most Expensive
B
Brilliant Earth
20881638A · Oct 30
£2,075 GBP
$2,780 USD
View
11 more retailers have this diamond
Prices start from £430 GBPSave up to £1,645 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
£430 GBP