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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 $731 AUD
£403 GBP
As of October 27, 2026
Save $4,278 AUD (85%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $5,008 AUD 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 $731 to $5,008, a $4,278 spread on the same certified stone. Brilliant Earth lists it at $5,008. 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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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 27
Current: $5,008 AUD|Low: $728 AUD|High: $9,460 AUD|Avg: $2,295 AUD|-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$731 AUD
Retailer 8$913 AUD
Retailer 4$1,013 AUD
Retailer 7$1,217 AUD
Retailer 3$1,318 AUD
Retailer 5$1,350 AUD
Retailer 11$1,393 AUD
Retailer 6$1,906 AUD
Retailer 2$1,959 AUD
Retailer 9$2,639 AUD
Retailer 12$3,106 AUD
Retailer 13$4,138 AUD
Brilliant Earth$5,008 AUD

39 data points across 13 retailers

13 retailers$731 AUD to $5,008 AUD

A
Cheapest Retailer
-
$731 AUD
£403 GBP
A
Retailer 2
-
$913 AUD
HK$5,000 HKD
View
Retailer 3
-
$1,013 AUD
$710 USD
View
Price last confirmed 5 days ago
A
Retailer 4
-
$1,217 AUD
€812 EUR
View
Retailer 5
-
$1,318 AUD
$924 USD
View
Price last confirmed 7 days ago
Retailer 6
-
$1,350 AUD
$946 USD
View
Price last confirmed 7 days ago
A
Retailer 7
-
$1,393 AUD
£769 GBP
View
A
Retailer 8
-
$1,906 AUD
$1,336 USD
View
B+
Retailer 9
-
$1,959 AUD
$1,373 USD
View
B+
Retailer 10
-
$2,639 AUD
SGD 2,499 SGD
View
B+
Retailer 11
-
$3,106 AUD
£1,714 GBP
View
Retailer 12
-
$4,138 AUD
$2,900 USD
View
Price last confirmed 14 days ago
Most Expensive
B
Brilliant Earth
16747795A · Nov 2
$5,008 AUD
$3,510 USD
View
12 more retailers have this diamond
Prices start from $731 AUDSave up to $4,278 AUD

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
$731 AUD