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Cushion|Lab Grown|IGI

3.99ct E SI1 Cushion Lab Grown Diamond

EX • E/SI1 • IGI LG814627389

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG814627389

Diamond specifications and retailer prices

From £2,605 GBP
$3,490 USD
As of October 29, 2026
1 retailer carries this diamond
Only listing: £2,605 GBP at Brilliant Earth
Only one retailer lists this diamond right now, and it is shown above, so there is nothing to unlock. Similar diamonds are carried by several retailers.
View at Brilliant Earth

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 LG814627389 or 814627389. Listed at a single retailer as of October 29, 2026. If it later appears at another store, Carat Hunter will surface the price comparison automatically. 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
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.4°
Pavilion angle36°
OriginLab Grown
Grading LabIGI
CertificateIGI LG814627389
Dimensions11.33 × 8.14 × 5.47 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
11.33 mm8.14 mm3.99 ctE / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG814627389
Side View
Table 61.0%Crown 36.4°Girdle: MED-STKPavilion 36°Culet: NoneDepth 67.2%

Caratlytics Score

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B
Good
Decent quality, room for better deals
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Price History

Last verified: Oct 29
Current: £622 GBP|Low: £614 GBP|High: £627 GBP|Avg: £620 GBP|-0.7%
September 29, 2026
Retailer 1£622 GBP

11 data points across 1 retailer

1 retailer

B
Brilliant Earth
21223089A · Oct 29
£2,605 GBP
$3,490 USD
View

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
£2,605 GBP