Cushion|Lab Grown|IGI

3.50ct D SI1 Cushion Lab Grown Diamond

ID • D/SI1 • IGI LG852654640

Shape and cutting style on the report: Square cushion modified brilliant

Certificate IGI LG852654640

Diamond specifications and retailer prices

From $880 USD
As of October 30, 2026
Save $1,255 USD (59%) vs most expensive(unlock to see where)
3 retailers carry this diamond
Most expensive: $2,135 USD at Taylor and Hart · As of October 30, 2026
View at Taylor and Hart

About this 3.5ct lab-grown cushion diamond

This 3.5ct lab-grown cushion sits in the three to five carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG852654640 or 852654640. Listed at 3 retailers as of October 30, 2026, with prices from $880 to $2,135, a $1,255 spread on the same certified stone. Taylor and Hart lists it at $2,135. 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

3.50
Carat
D
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle43.2°
Pavilion angle41.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG852654640
Dimensions8.79 × 7.99 × 5.73 mm
L/W Ratio1.10
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
8.79 mm7.99 mm3.50 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG852654640
Side View
Table 74.0%Crown 43.2°Girdle: STK-THKPavilion 41.7°CuletDepth 71.7%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 30
Current: $1,019 USD|Low: $880 USD|High: $2,135 USD|Avg: $1,410 USD
Retailer 1
Retailer 2
Taylor and Hart
October 31, 2026
Retailer 2$880 USD
Retailer 1$1,019 USD
Taylor and Hart$2,135 USD

2 data points across 3 retailers

3 retailers$880 USD to $2,135 USD

B+
Cheapest Retailer
-
$880 USD
B+
Retailer 2
-
$1,019 USD
£803 GBP
View
Most Expensive
B
Taylor and Hart
RY30UBB · Oct 30
$2,135 USD
View
2 more retailers have this diamond
Prices start from $880 USDSave up to $1,255 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.

B+
3.50ct Cushion
$880 USD