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Cushion|Lab Grown|IGI

3.51ct F SI1 Cushion Lab Grown Diamond

ID • F/SI1 • IGI LG826674126

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG826674126

Diamond specifications and retailer prices

From $858 AUD
HK$4,700 HKD
As of November 1, 2026
Save $3,337 AUD (80%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $4,195 AUD at Brilliant Earth · As of November 2, 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 LG826674126 or 826674126. Listed at 11 retailers as of November 1, 2026, with prices from $858 to $4,195, a $3,337 spread on the same certified stone. Brilliant Earth lists it at $4,195. 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 angle35°
Pavilion angle30.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG826674126
Dimensions10.14 × 7.69 × 5.03 mm
L/W Ratio1.32
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
10.14 mm7.69 mm3.51 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG826674126
Side View
Table 60.0%Crown 35°Girdle: MED-THKPavilion 30.4°Culet: NoneDepth 65.4%

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 1
Current: $4,195 AUD|Low: $858 AUD|High: $4,209 AUD|Avg: $2,031 AUD|-0.3%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 2, 2026
Retailer 5$858 AUD
Retailer 11$956 AUD
Retailer 6$982 AUD
Retailer 2$1,188 AUD
Retailer 10$1,251 AUD
Retailer 7$1,315 AUD
Retailer 3$1,871 AUD
Retailer 4$1,912 AUD
Retailer 8$2,941 AUD
Retailer 9$3,838 AUD
Brilliant Earth$4,195 AUD

38 data points across 11 retailers

11 retailers$858 AUD to $4,195 AUD

A
Cheapest Retailer
-
$858 AUD
HK$4,700 HKD
Retailer 2
-
$956 AUD
$670 USD
View
Price last confirmed 5 days ago
A
Retailer 3
-
$982 AUD
£542 GBP
View
A
Retailer 4
-
$1,188 AUD
€793 EUR
View
Retailer 5
-
$1,251 AUD
$877 USD
View
Price last confirmed 7 days ago
A
Retailer 6
-
$1,315 AUD
£726 GBP
View
A
Retailer 7
-
$1,871 AUD
$1,311 USD
View
B+
Retailer 8
-
$1,912 AUD
$1,340 USD
View
B+
Retailer 9
-
$2,941 AUD
£1,623 GBP
View
B
Retailer 10
-
$3,838 AUD
$2,690 USD
View
Most Expensive
B
Brilliant Earth
21013372A · Nov 2
$4,195 AUD
$2,940 USD
View
10 more retailers have this diamond
Prices start from $858 AUDSave up to $3,337 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
$858 AUD