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Cushion|Lab Grown|IGI

4.08ct F SI1 Cushion Lab Grown Diamond

VG • F/SI1 • IGI LG830689146

Shape and cutting style on the report: Cushion brilliant

Certificate IGI LG830689146

Diamond specifications and retailer prices

From $1,065 USD
As of November 2, 2026
Save $2,270 USD (68%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: $3,335 USD at MOH London · As of November 1, 2026
View at MOH London

About this 4.08ct lab-grown cushion diamond

This 4.08ct lab-grown cushion sits in the three to five carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a very-good cut grade and certified by IGI LG830689146 or 830689146. Listed at 8 retailers as of November 1, 2026, with prices from $1,065 to $3,335, a $2,270 spread on the same certified stone. MOH London lists it at $3,335. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

4.08
Carat
F
Color
SI1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle40.6°
Pavilion angle36.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG830689146
Dimensions11.91 × 8.45 × 5.51 mm
L/W Ratio1.41
Girdle conditionFaceted
Culet sizeLarge
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
11.91 mm8.45 mm4.08 ctF / SI1
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG830689146
Side View
Table 53.0%Crown 40.6°Girdle: MED-STKPavilion 36.3°Culet: LargeDepth 65.2%

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: Nov 2
Current: $3,335 USD|Low: $890 USD|High: $3,379 USD|Avg: $1,999 USD
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 2, 2026
Retailer 4$890 USD
Retailer 3$1,065 USD
Retailer 8$1,269 USD
Retailer 2$1,363 USD
Retailer 5$1,439 USD
Retailer 6$2,995 USD
Retailer 7$3,072 USD
MOH London$3,335 USD

41 data points across 8 retailers

8 retailers$1,065 USD to $3,335 USD

Retailer 1
-
$890 USD
Price last confirmed 20 days ago
A
Retailer 2
-
$1,065 USD
View
B+
Retailer 3
-
$1,269 USD
View
B+
Retailer 4
-
$1,363 USD
£1,074 GBP
View
B+
Retailer 5
-
$1,439 USD
View
B
Retailer 6
-
$2,995 USD
SGD 4,047 SGD
View
B
Retailer 7
-
$3,072 USD
View
Most Expensive
B
MOH London
LG830689146 · Nov 1
$3,335 USD
£2,626 GBP
View
7 more retailers have this diamond
Prices start from $1,065 USDSave up to $2,270 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
4.08ct Cushion
$1,065 USD