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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 $1,165 USD
As of October 30, 2026
Save $4,905 USD (81%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $6,070 USD 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 $1,165 to $6,070, a $4,905 spread on the same certified stone. Brilliant Earth lists it at $6,070. 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: $6,070 USD|Low: $495 USD|High: $6,250 USD|Avg: $1,857 USD|-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$495 USD
Retailer 11$513 USD
Retailer 8$813 USD
Retailer 7$1,165 USD
Retailer 10$1,230 USD
Retailer 4$1,298 USD
Retailer 2$1,302 USD
Retailer 6$1,721 USD
Retailer 9$2,739 USD
Retailer 5$3,208 USD
Brilliant Earth$6,070 USD

42 data points across 11 retailers

11 retailers$1,165 USD to $6,070 USD

Retailer 1
-
$813 USD
Price last confirmed 18 days ago
B+
Retailer 2
-
$1,165 USD
View
A
Retailer 3
-
$1,230 USD
View
A
Retailer 4
-
$1,298 USD
€1,236 EUR
View
A
Retailer 5
-
$1,302 USD
£1,025 GBP
View
B+
Retailer 6
-
$1,472 USD
View
B+
Retailer 7
-
$1,721 USD
A$2,648 AUD
View
B
Retailer 8
-
$2,739 USD
SGD 3,702 SGD
View
B
Retailer 9
-
$2,802 USD
View
B
Retailer 10
-
$3,208 USD
£2,526 GBP
View
Most Expensive
B
Brilliant Earth
20696587A · Oct 29
$6,070 USD
View
10 more retailers have this diamond
Prices start from $1,165 USDSave up to $4,905 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
4.05ct Cushion
$1,165 USD