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Cushion|Lab Grown|IGI

3.59ct F SI1 Cushion Lab Grown Diamond

ID • F/SI1 • IGI LG691587390

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG691587390

Diamond specifications and retailer prices

From $4,150 USD
As of November 2, 2026
1 retailer carries this diamond
Only listing: $4,150 USD at Brilliant Earth
Only one retailer lists this diamond right now, and it is shown above, so there is nothing to unlock. Similar diamonds are carried by several retailers.
View at Brilliant Earth

About this 3.59ct lab-grown cushion diamond

This 3.59ct 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 LG691587390 or 691587390. Listed at a single retailer as of November 2, 2026. If it later appears at another store, Carat Hunter will surface the price comparison automatically. 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

3.59
Carat
F
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle32.1°
Pavilion angle38.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG691587390
Dimensions10.84 × 8.07 × 5.56 mm
L/W Ratio1.34
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
10.84 mm8.07 mm3.59 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG691587390
Side View
Table 61.0%Crown 32.1°Girdle: MED-STKPavilion 38.6°Culet: NoneDepth 68.9%

Caratlytics Score

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B
Good
Decent quality, room for better deals
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Price History

Last verified: Nov 2
Current: $4,150 USD|Low: $870 USD|High: $4,690 USD|Avg: $3,268 USD|-4.4%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
April 14, 2026
Retailer 5$870 USD
Retailer 2$990 USD
Retailer 3$2,679 USD
Retailer 6$3,054 USD
Brilliant Earth$4,150 USD
Retailer 4$4,541 USD

18 data points across 6 retailers

1 retailer

B
Brilliant Earth
13478214A · Nov 2
$4,150 USD
View

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.

B
3.59ct Cushion
$4,150 USD