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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 €436 EUR
£384 GBP
As of November 2, 2026
Save €1,680 EUR (79%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: €2,117 EUR 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 €436 to €2,117, a €1,680 spread on the same certified stone. Rare Carat lists it at €2,117. 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
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 2
Current: €3,130 EUR|Low: €436 EUR|High: €5,156 EUR|Avg: €1,730 EUR
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€436 EUR
Retailer 10€561 EUR
Retailer 7€636 EUR
Retailer 6€765 EUR
Retailer 12€793 EUR
Retailer 9€815 EUR
Retailer 5€831 EUR
Retailer 11€1,045 EUR
Retailer 8€1,869 EUR
Rare Carat€3,130 EUR
Retailer 3€4,245 EUR
Retailer 4€5,156 EUR

6 data points across 12 retailers

10 retailers€436 EUR to €2,117 EUR

A
Cheapest Retailer
-
€436 EUR
£384 GBP
A
Retailer 2
-
€561 EUR
HK$4,900 HKD
View
A
Retailer 3
-
€636 EUR
$710 USD
View
A
Retailer 4
-
€765 EUR
View
B+
Retailer 5
-
€793 EUR
$886 USD
View
A
Retailer 6
-
€815 EUR
$910 USD
View
A
Retailer 7
-
€831 EUR
£731 GBP
View
A
Retailer 8
-
€1,045 EUR
$1,168 USD
View
B
Retailer 9
-
€1,869 EUR
£1,644 GBP
View
Most Expensive
B
Rare Carat
KI2715562KF677 · Oct 28
€2,117 EUR
$2,365 USD
View
9 more retailers have this diamond
Prices start from €436 EURSave up to €1,680 EUR

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
€436 EUR