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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 $625 USD
As of November 2, 2026
Save $2,315 USD (79%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: $2,940 USD 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 $625 to $2,940, a $2,315 spread on the same certified stone. Brilliant Earth lists it at $2,940. 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
Color
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: $2,940 USD|Low: $474 USD|High: $3,040 USD|Avg: $1,160 USD|-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$474 USD
Retailer 7$584 USD
Retailer 5$625 USD
Retailer 8$755 USD
Retailer 4$804 USD
Retailer 2$852 USD
Retailer 9$874 USD
Retailer 10$1,271 USD
Retailer 3$1,854 USD
Brilliant Earth$2,940 USD

38 data points across 10 retailers

8 retailers$625 USD to $2,940 USD

A
Cheapest Retailer
-
$625 USD
B+
Retailer 2
-
$755 USD
View
A
Retailer 3
-
$804 USD
€766 EUR
View
A
Retailer 4
-
$852 USD
£671 GBP
View
A
Retailer 5
-
$874 USD
View
A
Retailer 6
-
$1,271 USD
View
B+
Retailer 7
-
$1,854 USD
£1,460 GBP
View
Most Expensive
B
Brilliant Earth
8839180A · Oct 31
$2,940 USD
View
7 more retailers have this diamond
Prices start from $625 USDSave up to $2,315 USD

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
$625 USD