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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 €1,039 EUR
$1,165 USD
As of October 30, 2026
Save €4,373 EUR (81%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: €5,412 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 €1,039 to €5,412, a €4,373 spread on the same certified stone. Brilliant Earth lists it at €5,412. 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
Colour
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: €5,412 EUR|Low: €458 EUR|High: €5,572 EUR|Avg: €1,788 EUR|-2.9%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 1, 2026
Retailer 10€458 EUR
Retailer 7€725 EUR
Retailer 6€1,039 EUR
Retailer 9€1,097 EUR
Retailer 3€1,150 EUR
Retailer 2€1,151 EUR
Retailer 5€1,535 EUR
Retailer 8€2,442 EUR
Retailer 4€2,860 EUR
Brilliant Earth€5,412 EUR

41 data points across 10 retailers

11 retailers€1,039 EUR to €5,412 EUR

Retailer 1
-
€725 EUR
$813 USD
Price last confirmed 20 days ago
B+
Retailer 2
-
€1,039 EUR
$1,165 USD
View
A
Retailer 3
-
€1,097 EUR
$1,230 USD
View
A
Retailer 4
-
€1,150 EUR
View
A
Retailer 5
-
€1,151 EUR
£1,017 GBP
View
B+
Retailer 6
-
€1,312 EUR
$1,472 USD
View
B+
Retailer 7
-
€1,535 EUR
A$2,648 AUD
View
B
Retailer 8
-
€2,442 EUR
SGD 3,702 SGD
View
B
Retailer 9
-
€2,498 EUR
$2,802 USD
View
B
Retailer 10
-
€2,860 EUR
£2,526 GBP
View
Most Expensive
B
Brilliant Earth
20696587A · Oct 31
€5,412 EUR
$6,070 USD
View
10 more retailers have this diamond
Prices start from €1,039 EURSave up to €4,373 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
€1,039 EUR