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Cushion|Lab Grown|IGI

4.09ct F SI1 Cushion Lab Grown Diamond

ID • F/SI1 • IGI LG647448988

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG647448988

Diamond specifications and retailer prices

From $1,279 SGD
$1,000 USD
As of November 2, 2026
Save $1,656 SGD (56%) vs most expensive(unlock to see where)
3 retailers carry this diamond
Most expensive: $2,935 SGD 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 LG647448988 or 647448988. Listed at 3 retailers as of October 28, 2026, with prices from $1,279 to $2,935, a $1,656 spread on the same certified stone. Rare Carat lists it at $2,935. 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 angle36.9°
Pavilion angle38.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG647448988
Dimensions9.33 × 9.06 × 5.86 mm
L/W Ratio1.03
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
9.33 mm9.06 mm4.09 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG647448988
Side View
Table 67.0%Crown 36.9°Girdle: MED-STKPavilion 38.4°Culet: NoneDepth 64.7%

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: $2,935 SGD|Low: $1,279 SGD|High: $6,944 SGD|Avg: $3,864 SGD|-1.5%
Rare Carat
Retailer 2
Retailer 3
Retailer 4
Retailer 5
October 19, 2026
Retailer 3$1,279 SGD
Retailer 2$2,819 SGD
Rare Carat$2,935 SGD
Retailer 5$5,273 SGD
Retailer 4$6,944 SGD

4 data points across 5 retailers

3 retailers$1,279 SGD to $2,935 SGD

A
Cheapest Retailer
-
$1,279 SGD
$1,000 USD
B
Retailer 2
-
$2,819 SGD
$2,205 USD
View
Most Expensive
B
Rare Carat
LVA31-061A · Oct 28
$2,935 SGD
$2,295 USD
View
2 more retailers have this diamond
Prices start from $1,279 SGDSave up to $1,656 SGD

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
$1,279 SGD