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Cushion|Lab Grown|IGI

3.51ct F SI1 Cushion Lab Grown Diamond

ID • F/SI1 • IGI LG611390746

Shape and cutting style on the report: Cushion brilliant

Certificate IGI LG611390746

Diamond specifications and retailer prices

From $890 AUD
$625 USD
As of November 2, 2026
Save $3,296 AUD (79%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: $4,185 AUD at Brilliant Earth · As of October 31, 2026
View at Brilliant Earth

About this 3.51ct lab-grown cushion diamond

This 3.51ct 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 LG611390746 or 611390746. Listed at 8 retailers as of October 31, 2026, with prices from $890 to $4,185, a $3,296 spread on the same certified stone. Brilliant Earth lists it at $4,185. 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

3.51
Carat
F
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle29.8°
Pavilion angle37.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG611390746
Dimensions10.17 × 8.09 × 5.50 mm
L/W Ratio1.26
Girdle conditionFaceted
Culet sizePointed
Top View
10.17 mm8.09 mm3.51 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG611390746
Side View
Table 67.0%Crown 29.8°Girdle: MED-VTKPavilion 37.6°Culet: NoneDepth 68.0%

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: $4,185 AUD|Low: $675 AUD|High: $4,328 AUD|Avg: $1,652 AUD|-3.3%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 2, 2026
Retailer 6$675 AUD
Retailer 7$831 AUD
Retailer 5$890 AUD
Retailer 8$1,075 AUD
Retailer 4$1,145 AUD
Retailer 2$1,213 AUD
Retailer 9$1,244 AUD
Retailer 10$1,809 AUD
Retailer 3$2,640 AUD
Brilliant Earth$4,185 AUD

38 data points across 10 retailers

8 retailers$890 AUD to $4,185 AUD

A
Cheapest Retailer
-
$890 AUD
$625 USD
B+
Retailer 2
-
$1,075 AUD
$755 USD
View
A
Retailer 3
-
$1,145 AUD
€766 EUR
View
A
Retailer 4
-
$1,213 AUD
£671 GBP
View
A
Retailer 5
-
$1,244 AUD
$874 USD
View
A
Retailer 6
-
$1,809 AUD
$1,271 USD
View
B+
Retailer 7
-
$2,640 AUD
£1,460 GBP
View
Most Expensive
B
Brilliant Earth
8839180A · Oct 31
$4,185 AUD
$2,940 USD
View
7 more retailers have this diamond
Prices start from $890 AUDSave up to $3,296 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
3.51ct Cushion
$890 AUD