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Cushion|Lab Grown|IGI

4.00ct E SI1 Cushion Lab Grown Diamond

ID • E/SI1 • IGI LG794662539

Shape and cutting style on the report: Cushion brilliant

Certificate IGI LG794662539

Diamond specifications and retailer prices

From £627 GBP
$840 USD
As of October 31, 2026
Save £1,739 GBP (74%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: £2,366 GBP at Brilliant Earth · As of October 30, 2026
View at Brilliant Earth

About this 4ct lab-grown cushion diamond

This 4ct 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 LG794662539 or 794662539. Listed at 8 retailers as of October 30, 2026, with prices from £627 to £2,366, a £1,739 spread on the same certified stone. Brilliant Earth lists it at £2,366. 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

4.00
Carat
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle38.2°
Pavilion angle39.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG794662539
Dimensions10.92 × 8.22 × 5.66 mm
L/W Ratio1.33
Girdle conditionFaceted
Culet sizeLarge
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
10.92 mm8.22 mm4.00 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG794662539
Side View
Table 49.0%Crown 38.2°Girdle: STK-THKPavilion 39.3°Culet: LargeDepth 68.9%

Caratlytics Score

How it works →
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: Oct 31
Current: £2,366 GBP|Low: £383 GBP|High: £4,463 GBP|Avg: £1,211 GBP|-47.0%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
October 31, 2026
Retailer 9£383 GBP
Retailer 8£606 GBP
Retailer 3£627 GBP
Retailer 5£763 GBP
Retailer 6£814 GBP
Retailer 2£826 GBP
Retailer 4£1,044 GBP
Retailer 7£1,671 GBP
Brilliant Earth£2,366 GBP

41 data points across 9 retailers

8 retailers£627 GBP to £2,366 GBP

Retailer 1
-
£606 GBP
$812 USD
Price last confirmed 19 days ago
A
Retailer 2
-
£627 GBP
$840 USD
View
A
Retailer 3
-
£763 GBP
$1,022 USD
View
B+
Retailer 4
-
£814 GBP
$1,091 USD
View
A
Retailer 5
-
£826 GBP
View
B+
Retailer 6
-
£1,044 GBP
$1,399 USD
View
B
Retailer 7
-
£1,671 GBP
SGD 3,026 SGD
View
Most Expensive
B
Brilliant Earth
21584608A · Oct 30
£2,366 GBP
$3,170 USD
View
7 more retailers have this diamond
Prices start from £627 GBPSave up to £1,739 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
4.00ct Cushion
£627 GBP