CaratHunter
Plans
Cushion|Lab Grown|IGI

4.05ct F SI1 Cushion Lab Grown Diamond

EX • F/SI1 • IGI LG823613807

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG823613807

Diamond specifications and retailer prices

From $855 NZD
£379 GBP
As of November 2, 2026
Save $3,268 NZD (79%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $4,123 NZD at Rare Carat · As of October 28, 2026
View at Rare Carat

About this 4.05ct lab-grown cushion diamond

This 4.05ct 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 LG823613807 or 823613807. Listed at 11 retailers as of October 28, 2026, with prices from $855 to $4,123, a $3,268 spread on the same certified stone. Rare Carat lists it at $4,123. 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
F
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.2°
Pavilion angle37.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG823613807
Dimensions10.04 × 9.05 × 5.70 mm
L/W Ratio1.11
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
10.04 mm9.05 mm4.05 ctF / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG823613807
Side View
Table 64.0%Crown 34.2°Girdle: MED-THKPavilion 37.9°Culet: NoneDepth 63.0%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 2
Current: $855 NZD|Low: $759 NZD|High: $3,727 NZD|Avg: $1,901 NZD|-1.4%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 2, 2026
Retailer 1$855 NZD
Retailer 9$894 NZD
Retailer 10$992 NZD
Retailer 5$1,244 NZD
Retailer 2$1,329 NZD
Retailer 4$1,626 NZD
Retailer 8$2,039 NZD
Retailer 6$3,244 NZD
Retailer 7$3,374 NZD
Retailer 3$3,641 NZD

31 data points across 10 retailers

11 retailers$855 NZD to $4,123 NZD

A
Cheapest Retailer
-
$855 NZD
£379 GBP
A
Retailer 2
-
$894 NZD
$503 USD
View
Final sale: no returns
Retailer 3
-
$992 NZD
$558 USD
View
Price last confirmed 17 days ago
A
Retailer 4
-
$1,244 NZD
$700 USD
View
B+
Retailer 5
-
$1,329 NZD
$748 USD
View
A
Retailer 6
-
$1,626 NZD
£721 GBP
View
A
Retailer 7
-
$2,039 NZD
$1,147 USD
View
B
Retailer 8
-
$3,244 NZD
$1,825 USD
View
B
Retailer 9
-
$3,374 NZD
$1,898 USD
View
B
Retailer 10
-
$3,641 NZD
£1,613 GBP
View
Most Expensive
B
Rare Carat
G 2 A_l_823613807 · Oct 28
$4,123 NZD
$2,320 USD
View
10 more retailers have this diamond
Prices start from $855 NZDSave up to $3,268 NZD

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
$855 NZD