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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 $488 USD
£384 GBP
As of November 2, 2026
Save $1,877 USD (79%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: $2,365 USD 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 $488 to $2,365, a $1,877 spread on the same certified stone. Rare Carat lists it at $2,365. 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
Color
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: $3,497 USD|Low: $488 USD|High: $5,760 USD|Avg: $1,932 USD
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$488 USD
Retailer 10$627 USD
Retailer 7$710 USD
Retailer 6$855 USD
Retailer 12$886 USD
Retailer 9$910 USD
Retailer 5$928 USD
Retailer 11$1,168 USD
Retailer 8$2,088 USD
Rare Carat$3,497 USD
Retailer 3$4,742 USD
Retailer 4$5,760 USD

6 data points across 12 retailers

10 retailers$488 USD to $2,365 USD

A
Cheapest Retailer
-
$488 USD
£384 GBP
A
Retailer 2
-
$627 USD
HK$4,900 HKD
View
A
Retailer 3
-
$710 USD
View
A
Retailer 4
-
$855 USD
€814 EUR
View
B+
Retailer 5
-
$886 USD
View
A
Retailer 6
-
$910 USD
View
A
Retailer 7
-
$928 USD
£731 GBP
View
A
Retailer 8
-
$1,168 USD
View
B
Retailer 9
-
$2,088 USD
£1,644 GBP
View
Most Expensive
B
Rare Carat
KI2715562KF677 · Oct 28
$2,365 USD
View
9 more retailers have this diamond
Prices start from $488 USDSave up to $1,877 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
4.09ct Cushion
$488 USD