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Cushion|Lab Grown|IGI

4.09ct F SI1 Cushion Lab Grown Diamond

ID • F/SI1 • IGI LG677556271

Shape and cutting style on the report: Cushion brilliant

Certificate IGI LG677556271

Diamond specifications and retailer prices

From $696 AUD
£384 GBP
As of November 2, 2026
Save $2,679 AUD (79%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: $3,375 AUD at Rare Carat · As of October 28, 2026
View at Rare Carat

About this 4.09ct lab-grown cushion diamond

This 4.09ct 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 LG677556271 or 677556271. Listed at 10 retailers as of October 28, 2026, with prices from $696 to $3,375, a $2,679 spread on the same certified stone. Rare Carat lists it at $3,375. 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

4.09
Carat
F
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.8°
Pavilion angle38.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG677556271
Dimensions10.61 × 8.73 × 5.91 mm
L/W Ratio1.22
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
10.61 mm8.73 mm4.09 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG677556271
Side View
Table 61.0%Crown 33.8°Girdle: MED-STKPavilion 38.2°Culet: NoneDepth 67.7%

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: $4,989 AUD|Low: $696 AUD|High: $8,219 AUD|Avg: $2,757 AUD
Rare Carat
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 2, 2026
Retailer 2$696 AUD
Retailer 10$895 AUD
Retailer 7$1,013 AUD
Retailer 6$1,220 AUD
Retailer 12$1,264 AUD
Retailer 9$1,298 AUD
Retailer 5$1,324 AUD
Retailer 11$1,667 AUD
Retailer 8$2,979 AUD
Rare Carat$4,989 AUD
Retailer 3$6,767 AUD
Retailer 4$8,219 AUD

6 data points across 12 retailers

10 retailers$696 AUD to $3,375 AUD

A
Cheapest Retailer
-
$696 AUD
£384 GBP
A
Retailer 2
-
$895 AUD
HK$4,900 HKD
View
A
Retailer 3
-
$1,013 AUD
$710 USD
View
A
Retailer 4
-
$1,220 AUD
€814 EUR
View
B+
Retailer 5
-
$1,264 AUD
$886 USD
View
A
Retailer 6
-
$1,298 AUD
$910 USD
View
A
Retailer 7
-
$1,324 AUD
£731 GBP
View
A
Retailer 8
-
$1,667 AUD
$1,168 USD
View
B
Retailer 9
-
$2,979 AUD
£1,644 GBP
View
Most Expensive
B
Rare Carat
KI2715562KF677 · Oct 28
$3,375 AUD
$2,365 USD
View
9 more retailers have this diamond
Prices start from $696 AUDSave up to $2,679 AUD

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
4.09ct Cushion
$696 AUD