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Cushion|Lab Grown|IGI

3.99ct E SI1 Cushion Lab Grown Diamond

ID • E/SI1 • IGI LG828639975

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG828639975

Diamond specifications and retailer prices

From £1,023 GBP
$1,371 USD
As of October 30, 2026
Save £3,604 GBP (78%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: £4,627 GBP at Do Amore Diamonds · As of October 31, 2026
View at Do Amore Diamonds

About this 3.99ct lab-grown cushion diamond

This 3.99ct 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 LG828639975 or 828639975. Listed at 5 retailers as of October 30, 2026, with prices from £1,023 to £4,627, a £3,604 spread on the same certified stone. Do Amore Diamonds lists it at £4,627. 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

3.99
Carat
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishVery Good
SymmetryVery Good
FluorescenceNone
Crown angle38.4°
Pavilion angle31.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG828639975
Dimensions11.51 × 8.14 × 5.06 mm
L/W Ratio1.41
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
11.51 mm8.14 mm3.99 ctE / SI1
OriginLab Grown
CutIdeal
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateIGI LG828639975
Side View
Table 66.0%Crown 38.4°Girdle: THK-VTKPavilion 31.4°CuletDepth 62.2%

Caratlytics Score

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

Price History

Last verified: Oct 30
Current: £4,627 GBP|Low: £765 GBP|High: £4,836 GBP|Avg: £2,352 GBP
Do Amore Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
October 31, 2026
Retailer 4£917 GBP
Retailer 5£1,023 GBP
Retailer 3£1,026 GBP
Retailer 2£2,626 GBP
Do Amore Diamonds£4,627 GBP

22 data points across 5 retailers

5 retailers£1,023 GBP to £4,627 GBP

Retailer 1
-
£917 GBP
Price last confirmed 14 days ago
B+
Retailer 2
-
£1,023 GBP
$1,371 USD
View
B+
Retailer 3
-
£1,026 GBP
$1,375 USD
View
B
Retailer 4
-
£2,626 GBP
View
Most Expensive
B
Do Amore Diamonds
7-1791800 · Oct 31
£4,627 GBP
$6,200 USD
View
4 more retailers have this diamond
Prices start from £1,023 GBPSave up to £3,604 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+
3.99ct Cushion
£1,023 GBP