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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 HK$9,140 HKD
$1,165 USD
As of October 30, 2026
Save HK$38,483 HKD (81%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: HK$47,623 HKD 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 HK$9,140 to HK$47,623, a HK$38,483 spread on the same certified stone. Brilliant Earth lists it at HK$47,623. 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: HK$47,623 HKD|Low: HK$3,884 HKD|High: HK$49,036 HKD|Avg: HK$14,591 HKD|-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 3HK$3,884 HKD
Retailer 11HK$4,028 HKD
Retailer 8HK$6,379 HKD
Retailer 7HK$9,140 HKD
Retailer 10HK$9,650 HKD
Retailer 2HK$10,116 HKD
Retailer 4HK$10,215 HKD
Retailer 6HK$13,504 HKD
Retailer 9HK$21,493 HKD
Retailer 5HK$25,169 HKD
Brilliant EarthHK$47,623 HKD

41 data points across 11 retailers

11 retailersHK$9,140 HKD to HK$47,623 HKD

Retailer 1
-
HK$6,379 HKD
$813 USD
Price last confirmed 19 days ago
B+
Retailer 2
-
HK$9,140 HKD
$1,165 USD
View
A
Retailer 3
-
HK$9,650 HKD
$1,230 USD
View
A
Retailer 4
-
HK$10,116 HKD
€1,228 EUR
View
A
Retailer 5
-
HK$10,215 HKD
£1,025 GBP
View
B+
Retailer 6
-
HK$11,549 HKD
$1,472 USD
View
B+
Retailer 7
-
HK$13,504 HKD
A$2,648 AUD
View
B
Retailer 8
-
HK$21,493 HKD
SGD 3,702 SGD
View
B
Retailer 9
-
HK$21,980 HKD
$2,802 USD
View
B
Retailer 10
-
HK$25,169 HKD
£2,526 GBP
View
Most Expensive
B
Brilliant Earth
20696587A · Oct 31
HK$47,623 HKD
$6,070 USD
View
10 more retailers have this diamond
Prices start from HK$9,140 HKDSave up to HK$38,483 HKD

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
HK$9,140 HKD