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Cushion|Lab Grown|IGI

3.51ct E SI1 Cushion Lab Grown Diamond

EX • E/SI1 • IGI LG823696410

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG823696410

Diamond specifications and retailer prices

From HK$3,821 HKD
$487 USD
As of October 27, 2026
Save HK$17,992 HKD (82%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: HK$21,813 HKD at Brilliant Earth · As of October 30, 2026
View at Brilliant Earth

About this 3.51ct lab-grown cushion diamond

This 3.51ct 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 LG823696410 or 823696410. Listed at 13 retailers as of October 27, 2026, with prices from HK$3,821 to HK$21,813, a HK$17,992 spread on the same certified stone. Brilliant Earth lists it at HK$21,813. 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

3.51
Carat
E
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.3°
Pavilion angle36.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG823696410
Dimensions10.54 × 7.56 × 5.12 mm
L/W Ratio1.39
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
10.54 mm7.56 mm3.51 ctE / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG823696410
Side View
Table 63.0%Crown 36.3°Girdle: MED-THKPavilion 36.4°Culet: NoneDepth 67.7%

Caratlytics Score

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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: Oct 27
Current: HK$21,813 HKD|Low: HK$3,821 HKD|High: HK$41,115 HKD|Avg: HK$12,216 HKD|-46.9%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
October 30, 2026
Retailer 5HK$3,821 HKD
Retailer 11HK$4,620 HKD
Retailer 8HK$5,210 HKD
Retailer 7HK$5,375 HKD
Retailer 2HK$6,434 HKD
Retailer 3HK$6,677 HKD
Retailer 9HK$6,962 HKD
Retailer 13HK$10,263 HKD
Retailer 4HK$10,663 HKD
Retailer 6HK$13,326 HKD
Retailer 10HK$15,605 HKD
Retailer 12HK$21,107 HKD
Brilliant EarthHK$21,813 HKD

40 data points across 13 retailers

13 retailersHK$3,821 HKD to HK$21,813 HKD

A
Cheapest Retailer
-
HK$3,821 HKD
$487 USD
Final sale: no returns
A
Retailer 2
-
HK$4,620 HKD
View
A
Retailer 3
-
HK$5,210 HKD
£523 GBP
View
A
Retailer 4
-
HK$5,375 HKD
$685 USD
View
A
Retailer 5
-
HK$6,434 HKD
€781 EUR
View
B+
Retailer 6
-
HK$6,677 HKD
$851 USD
View
A
Retailer 7
-
HK$6,962 HKD
£699 GBP
View
B+
Retailer 8
-
HK$10,263 HKD
$1,308 USD
View
B+
Retailer 9
-
HK$10,663 HKD
$1,359 USD
View
B+
Retailer 10
-
HK$13,326 HKD
SGD 2,295 SGD
View
B+
Retailer 11
-
HK$15,605 HKD
£1,566 GBP
View
B
Retailer 12
-
HK$21,107 HKD
$2,690 USD
View
Most Expensive
B
Brilliant Earth
20881638A · Oct 30
HK$21,813 HKD
$2,780 USD
View
12 more retailers have this diamond
Prices start from HK$3,821 HKDSave up to HK$17,992 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
3.51ct Cushion
HK$3,821 HKD