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Cushion|Lab Grown|IGI

4.50ct F SI1 Cushion Lab Grown Diamond

ID • F/SI1 • IGI LG778683718

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG778683718

Diamond specifications and retailer prices

From £738 GBP
$990 USD
As of November 2, 2026
Save £3,415 GBP (82%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £4,153 GBP at Mervis Diamond Importers · As of November 2, 2026
View at Mervis Diamond Importers

About this 4.5ct lab-grown cushion diamond

This 4.5ct 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 LG778683718 or 778683718. Listed at 11 retailers as of November 2, 2026, with prices from £738 to £4,153, a £3,415 spread on the same certified stone. Mervis Diamond Importers lists it at £4,153. 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

4.50
Carat
F
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.4°
Pavilion angle34.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG778683718
Dimensions12.18 × 8.64 × 5.48 mm
L/W Ratio1.41
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
12.18 mm8.64 mm4.50 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG778683718
Side View
Table 60.0%Crown 33.4°Girdle: MED-STKPavilion 34.5°Culet: NoneDepth 63.4%

Caratlytics Score

How it works →
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: £4,153 GBP|Low: £607 GBP|High: £4,512 GBP|Avg: £1,662 GBP|-8.0%
Mervis Diamond Importers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 2, 2026
Retailer 10£607 GBP
Retailer 5£738 GBP
Retailer 9£857 GBP
Retailer 6£930 GBP
Retailer 11£931 GBP
Retailer 2£1,027 GBP
Retailer 3£1,623 GBP
Retailer 8£2,142 GBP
Retailer 7£2,373 GBP
Retailer 4£2,512 GBP
Mervis Diamond Importers£4,153 GBP

41 data points across 11 retailers

11 retailers£738 GBP to £4,153 GBP

Retailer 1
-
£607 GBP
$815 USD
Price last confirmed 21 days ago
A
Retailer 2
-
£738 GBP
$990 USD
View
Retailer 3
-
£857 GBP
$1,150 USD
View
Price last confirmed 12 days ago
A
Retailer 4
-
£930 GBP
$1,248 USD
View
A
Retailer 5
-
£931 GBP
$1,250 USD
View
A
Retailer 6
-
£1,027 GBP
View
B+
Retailer 7
-
£1,623 GBP
$2,178 USD
View
Retailer 8
-
£2,142 GBP
$2,875 USD
View
Price last confirmed 14 days ago
B
Retailer 9
-
£2,373 GBP
$3,184 USD
View
B
Retailer 10
-
£2,512 GBP
View
Most Expensive
B
Mervis Diamond Importers
1985410031 · Nov 2
£4,153 GBP
$5,573 USD
View
10 more retailers have this diamond
Prices start from £738 GBPSave up to £3,415 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
4.50ct Cushion
£738 GBP