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Cushion|Lab Grown|IGI

4.05ct E SI1 Cushion Lab Grown Diamond

ID • E/SI1 • IGI LG788683920

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

Certificate IGI LG788683920

Diamond specifications and retailer prices

From $1,627 CAD
$1,165 USD
As of October 30, 2026
Save $6,852 CAD (81%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $8,479 CAD at Brilliant Earth · As of October 29, 2026
View at Brilliant Earth

About this 4.05ct lab-grown cushion diamond

This 4.05ct lab-grown cushion sits in the three to five carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG788683920 or 788683920. Listed at 11 retailers as of October 29, 2026, with prices from $1,627 to $8,479, a $6,852 spread on the same certified stone. Brilliant Earth lists it at $8,479. 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

4.05
Carat
E
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.2°
Pavilion angle41.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG788683920
Dimensions9.79 × 9.33 × 5.59 mm
L/W Ratio1.05
Girdle conditionFaceted
Culet sizeLarge
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
9.79 mm9.33 mm4.05 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG788683920
Side View
Table 59.0%Crown 34.2°Girdle: THK-VTKPavilion 41.3°Culet: LargeDepth 59.9%

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: Oct 30
Current: $8,479 CAD|Low: $691 CAD|High: $8,731 CAD|Avg: $2,595 CAD|-2.9%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
October 31, 2026
Retailer 3$691 CAD
Retailer 11$717 CAD
Retailer 8$1,136 CAD
Retailer 7$1,627 CAD
Retailer 10$1,718 CAD
Retailer 4$1,813 CAD
Retailer 2$1,819 CAD
Retailer 6$2,404 CAD
Retailer 9$3,827 CAD
Retailer 5$4,481 CAD
Brilliant Earth$8,479 CAD

42 data points across 11 retailers

11 retailers$1,627 CAD to $8,479 CAD

Retailer 1
-
$1,136 CAD
$813 USD
Price last confirmed 19 days ago
B+
Retailer 2
-
$1,627 CAD
$1,165 USD
View
A
Retailer 3
-
$1,718 CAD
$1,230 USD
View
A
Retailer 4
-
$1,813 CAD
€1,236 EUR
View
A
Retailer 5
-
$1,819 CAD
£1,025 GBP
View
B+
Retailer 6
-
$2,056 CAD
$1,472 USD
View
B+
Retailer 7
-
$2,404 CAD
A$2,648 AUD
View
B
Retailer 8
-
$3,827 CAD
SGD 3,702 SGD
View
B
Retailer 9
-
$3,914 CAD
$2,802 USD
View
B
Retailer 10
-
$4,481 CAD
£2,526 GBP
View
Most Expensive
B
Brilliant Earth
20696587A · Oct 29
$8,479 CAD
$6,070 USD
View
10 more retailers have this diamond
Prices start from $1,627 CADSave up to $6,852 CAD

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
4.05ct Cushion
$1,627 CAD