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Cushion|Lab Grown|IGI

4.05ct E SI1 Cushion Lab Grown Diamond

ID • E/SI1 • IGI LG788683920

Shape and cutting style on the report: Square cushion modified brilliant

Certificate IGI LG788683920

Diamond specifications and retailer prices

From €1,043 EUR
$1,165 USD
As of October 30, 2026
Save €4,390 EUR (81%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: €5,433 EUR at Brilliant Earth · As of October 31, 2026
View at Brilliant Earth

About this 4.05ct lab-grown cushion diamond

This 4.05ct lab-grown cushion sits in the three to five carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG788683920 or 788683920. Listed at 11 retailers as of October 30, 2026, with prices from €1,043 to €5,433, a €4,390 spread on the same certified stone. Brilliant Earth lists it at €5,433. 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
E
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.2°
Pavilion angle41.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG788683920
Dimensions9.79 × 9.33 × 5.59 mm
L/W Ratio1.05
Girdle conditionFaceted
Culet sizeLarge
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
9.79 mm9.33 mm4.05 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG788683920
Side View
Table 59.0%Crown 34.2°Girdle: THK-VTKPavilion 41.3°Culet: LargeDepth 59.9%

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: Oct 30
Current: €5,433 EUR|Low: €443 EUR|High: €5,594 EUR|Avg: €1,665 EUR|-2.9%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
October 31, 2026
Retailer 3€443 EUR
Retailer 11€460 EUR
Retailer 8€728 EUR
Retailer 7€1,043 EUR
Retailer 10€1,101 EUR
Retailer 2€1,154 EUR
Retailer 4€1,165 EUR
Retailer 6€1,541 EUR
Retailer 9€2,452 EUR
Retailer 5€2,871 EUR
Brilliant Earth€5,433 EUR

41 data points across 11 retailers

11 retailers€1,043 EUR to €5,433 EUR

Retailer 1
-
€728 EUR
$813 USD
Price last confirmed 19 days ago
B+
Retailer 2
-
€1,043 EUR
$1,165 USD
View
A
Retailer 3
-
€1,101 EUR
$1,230 USD
View
A
Retailer 4
-
€1,154 EUR
View
A
Retailer 5
-
€1,165 EUR
£1,025 GBP
View
B+
Retailer 6
-
€1,318 EUR
$1,472 USD
View
B+
Retailer 7
-
€1,541 EUR
A$2,648 AUD
View
B
Retailer 8
-
€2,452 EUR
SGD 3,702 SGD
View
B
Retailer 9
-
€2,508 EUR
$2,802 USD
View
B
Retailer 10
-
€2,871 EUR
£2,526 GBP
View
Most Expensive
B
Brilliant Earth
20696587A · Oct 31
€5,433 EUR
$6,070 USD
View
10 more retailers have this diamond
Prices start from €1,043 EURSave up to €4,390 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
4.05ct Cushion
€1,043 EUR