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Cushion|Lab Grown|IGI

4.09ct F VS1 Cushion Lab Grown Diamond

EX • F/VS1 • IGI LG816617452

Shape and cutting style on the report: Square cushion modified brilliant

Certificate IGI LG816617452

Diamond specifications and retailer prices

From £394 GBP
As of November 2, 2026
Save £2,831 GBP (88%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £3,224 GBP at Brilliant Earth · As of October 31, 2026
View at Brilliant Earth

About this 4.09ct lab-grown cushion diamond

This 4.09ct lab-grown cushion sits in the three to five carat band, graded F colour (colourless) and VS1 clarity (very-slightly-included), with a top-tier cut grade and certified by IGI LG816617452 or 816617452. Listed at 14 retailers as of October 31, 2026, with prices from £394 to £3,224, a £2,831 spread on the same certified stone. Brilliant Earth lists it at £3,224. Lab-grown prices in the 2ct and up range have fallen 40 to 60% over the last 18 months. Use the cross-retailer spread above to find the lowest current listing.

The 4Cs

4.09
Carat
F
Colour
VS1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle45.7°
Pavilion angle30.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG816617452
Dimensions9.06 × 8.52 × 5.71 mm
L/W Ratio1.06
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
9.06 mm8.52 mm4.09 ctF / VS1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG816617452
Side View
Table 65.0%Crown 45.7°Girdle: STK-THKPavilion 30.3°Culet: NoneDepth 67.0%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 2
Current: £3,224 GBP|Low: £394 GBP|High: £5,560 GBP|Avg: £1,539 GBP|-42.0%
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
Retailer 14
November 2, 2026
Retailer 2£394 GBP
Retailer 11£575 GBP
Retailer 3£633 GBP
Retailer 8£718 GBP
Retailer 12£769 GBP
Retailer 7£786 GBP
Retailer 10£945 GBP
Retailer 14£1,177 GBP
Retailer 13£1,493 GBP
Retailer 4£1,535 GBP
Retailer 9£1,647 GBP
Retailer 5£1,995 GBP
Retailer 6£2,302 GBP
Brilliant Earth£3,224 GBP

42 data points across 14 retailers

14 retailers£394 GBP to £3,224 GBP

A
Cheapest Retailer
-
£394 GBP
A
Retailer 2
-
£575 GBP
$770 USD
View
B+
Retailer 3
-
£633 GBP
$848 USD
View
A
Retailer 4
-
£718 GBP
€916 EUR
View
A
Retailer 5
-
£769 GBP
$1,031 USD
View
A
Retailer 6
-
£786 GBP
View
A
Retailer 7
-
£945 GBP
A$1,948 AUD
View
A
Retailer 8
-
£1,177 GBP
$1,577 USD
View
B+
Retailer 9
-
£1,493 GBP
SGD 2,703 SGD
View
B+
Retailer 10
-
£1,535 GBP
$2,056 USD
View
B+
Retailer 11
-
£1,647 GBP
$2,207 USD
View
B+
Retailer 12
-
£1,995 GBP
View
Retailer 13
-
£2,302 GBP
$3,085 USD
View
Price last confirmed 25 days ago
Most Expensive
B
Brilliant Earth
22374626A · Oct 31
£3,224 GBP
$4,320 USD
View
13 more retailers have this diamond
Prices start from £394 GBPSave up to £2,831 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
4.09ct Cushion
£394 GBP