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Cushion|Lab Grown|IGI

4.51ct F SI1 Cushion Lab Grown Diamond

ID • F/SI1 • IGI LG741592352

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

Certificate IGI LG741592352

Diamond specifications and retailer prices

From £382 GBP
As of October 27, 2026
Save £2,234 GBP (85%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £2,616 GBP at Brilliant Earth · As of November 2, 2026
View at Brilliant Earth

About this 4.51ct lab-grown cushion diamond

This 4.51ct 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 LG741592352 or 741592352. Listed at 13 retailers as of October 27, 2026, with prices from £382 to £2,616, a £2,234 spread on the same certified stone. Brilliant Earth lists it at £2,616. 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

4.51
Carat
F
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.8°
Pavilion angle33.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG741592352
Dimensions9.61 × 9.57 × 5.81 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
9.61 mm9.57 mm4.51 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG741592352
Side View
Table 65.0%Crown 34.8°Girdle: MED-THKPavilion 33.5°Culet: NoneDepth 60.7%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Oct 27
Current: £2,616 GBP|Low: £380 GBP|High: £4,941 GBP|Avg: £1,203 GBP|-47.1%
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
November 2, 2026
Retailer 10£382 GBP
Retailer 8£477 GBP
Retailer 4£529 GBP
Retailer 6£635 GBP
Retailer 3£689 GBP
Retailer 5£705 GBP
Retailer 11£728 GBP
Retailer 2£996 GBP
Retailer 7£1,008 GBP
Retailer 9£1,378 GBP
Retailer 12£1,622 GBP
Retailer 13£2,161 GBP
Brilliant Earth£2,616 GBP

39 data points across 13 retailers

13 retailers£382 GBP to £2,616 GBP

A
Cheapest Retailer
-
£382 GBP
A
Retailer 2
-
£477 GBP
HK$5,000 HKD
View
Retailer 3
-
£529 GBP
$710 USD
View
Price last confirmed 5 days ago
A
Retailer 4
-
£635 GBP
€812 EUR
View
B+
Retailer 5
-
£689 GBP
$924 USD
View
Price last confirmed 6 days ago
A
Retailer 6
-
£705 GBP
$946 USD
View
Price last confirmed 7 days ago
A
Retailer 7
-
£728 GBP
View
A
Retailer 8
-
£996 GBP
$1,336 USD
View
A
Retailer 9
-
£1,008 GBP
$1,353 USD
View
B+
Retailer 10
-
£1,378 GBP
SGD 2,499 SGD
View
B+
Retailer 11
-
£1,622 GBP
View
Retailer 12
-
£2,161 GBP
$2,900 USD
View
Price last confirmed 14 days ago
Most Expensive
B
Brilliant Earth
16747795A · Nov 2
£2,616 GBP
$3,510 USD
View
12 more retailers have this diamond
Prices start from £382 GBPSave up to £2,234 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
4.51ct Cushion
£382 GBP