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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 $602 USD
HK$4,700 HKD
As of November 1, 2026
Save $2,338 USD (80%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $2,940 USD 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 $602 to $2,940, a $2,338 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 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

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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: Nov 1
Current: $2,940 USD|Low: $602 USD|High: $2,950 USD|Avg: $1,425 USD|-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$602 USD
Retailer 11$670 USD
Retailer 6$688 USD
Retailer 2$833 USD
Retailer 10$877 USD
Retailer 7$922 USD
Retailer 3$1,311 USD
Retailer 4$1,340 USD
Retailer 8$2,061 USD
Retailer 9$2,690 USD
Brilliant Earth$2,940 USD

37 data points across 11 retailers

11 retailers$602 USD to $2,940 USD

A
Cheapest Retailer
-
$602 USD
HK$4,700 HKD
Retailer 2
-
$670 USD
View
Price last confirmed 6 days ago
A
Retailer 3
-
$688 USD
£542 GBP
View
A
Retailer 4
-
$833 USD
€793 EUR
View
Retailer 5
-
$877 USD
View
Price last confirmed 7 days ago
Retailer 6
-
$922 USD
£726 GBP
View
Price last confirmed 7 days ago
A
Retailer 7
-
$1,311 USD
View
B+
Retailer 8
-
$1,340 USD
View
Retailer 9
-
$2,061 USD
£1,623 GBP
View
Price last confirmed 7 days ago
B
Retailer 10
-
$2,690 USD
View
Most Expensive
B
Brilliant Earth
21013372A · Nov 2
$2,940 USD
View
10 more retailers have this diamond
Prices start from $602 USDSave up to $2,338 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
$602 USD