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Cushion|Lab Grown|IGI

4.06ct F SI1 Cushion Lab Grown Diamond

ID • F/SI1 • IGI LG617417790

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG617417790

Diamond specifications and retailer prices

From £578 GBP
$775 USD
As of November 2, 2026
Save £1,777 GBP (75%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £2,355 GBP at Brilliant Earth · As of November 2, 2026
View at Brilliant Earth

About this 4.06ct lab-grown cushion diamond

This 4.06ct lab-grown cushion sits in the three to five carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG617417790 or 617417790. Listed at 10 retailers as of November 2, 2026, with prices from £578 to £2,355, a £1,777 spread on the same certified stone. Brilliant Earth lists it at £2,355. 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

4.06
Carat
F
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.7°
Pavilion angle39.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG617417790
Dimensions9.33 × 9.25 × 6.05 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process and may include post-growth treatment Type IIa
Top View
9.33 mm9.25 mm4.06 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG617417790
Side View
Table 64.0%Crown 35.7°Girdle: MED-STKPavilion 39.1°Culet: NoneDepth 65.4%

Caratlytics Score

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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: Nov 2
Current: £2,355 GBP|Low: £353 GBP|High: £2,437 GBP|Avg: £1,067 GBP|-3.4%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 2, 2026
Retailer 7£412 GBP
Retailer 8£475 GBP
Retailer 6£578 GBP
Retailer 5£657 GBP
Retailer 2£736 GBP
Retailer 11£736 GBP
Retailer 9£771 GBP
Retailer 10£874 GBP
Retailer 4£1,984 GBP
Retailer 3£2,252 GBP
Brilliant Earth£2,355 GBP

35 data points across 11 retailers

10 retailers£578 GBP to £2,355 GBP

Retailer 1
-
£475 GBP
$638 USD
Price last confirmed 23 days ago
A
Retailer 2
-
£578 GBP
$775 USD
View
A
Retailer 3
-
£657 GBP
€840 EUR
View
A
Retailer 4
-
£736 GBP
View
B+
Retailer 5
-
£736 GBP
$988 USD
View
A
Retailer 6
-
£771 GBP
$1,035 USD
View
A
Retailer 7
-
£874 GBP
$1,173 USD
View
B
Retailer 8
-
£1,984 GBP
View
B
Retailer 9
-
£2,252 GBP
$3,022 USD
View
Most Expensive
B
Brilliant Earth
8988689A · Nov 2
£2,355 GBP
$3,160 USD
View
9 more retailers have this diamond
Prices start from £578 GBPSave up to £1,777 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
4.06ct Cushion
£578 GBP