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Cushion|Lab Grown|IGI

3.18ct D SI1 Cushion Lab Grown Diamond

EX • D/SI1 • IGI LG639415932

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG639415932

Diamond specifications and retailer prices

From HK$4,590 HKD
$585 USD
As of October 31, 2026
Save HK$12,319 HKD (73%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: HK$16,909 HKD at MOH London · As of November 1, 2026
View at MOH London

About this 3.18ct lab-grown cushion diamond

This 3.18ct lab-grown cushion sits in the three to five carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG639415932 or 639415932. Listed at 11 retailers as of October 31, 2026, with prices from HK$4,590 to HK$16,909, a HK$12,319 spread on the same certified stone. MOH London lists it at HK$16,909. 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

3.18
Carat
D
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.6°
Pavilion angle39.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG639415932
Dimensions8.76 × 8.65 × 5.53 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
8.76 mm8.65 mm3.18 ctD / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG639415932
Side View
Table 63.0%Crown 34.6°Girdle: MED-STKPavilion 39.6°Culet: NoneDepth 63.9%

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: Oct 31
Current: HK$16,909 HKD|Low: HK$4,590 HKD|High: HK$21,473 HKD|Avg: HK$8,777 HKD|-20.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 1, 2026
Retailer 3HK$4,590 HKD
Retailer 9HK$4,605 HKD
Retailer 8HK$5,021 HKD
Retailer 5HK$5,688 HKD
Retailer 6HK$6,002 HKD
Retailer 4HK$6,945 HKD
Retailer 7HK$6,967 HKD
Retailer 2HK$7,571 HKD
Retailer 10HK$13,189 HKD
Retailer 11HK$14,602 HKD
MOH LondonHK$16,909 HKD

44 data points across 11 retailers

11 retailersHK$4,590 HKD to HK$16,909 HKD

A
Cheapest Retailer
-
HK$4,590 HKD
$585 USD
Final sale: no returns
Retailer 2
-
HK$4,605 HKD
$587 USD
View
Price last confirmed 16 days ago
A
Retailer 3
-
HK$5,021 HKD
View
A
Retailer 4
-
HK$5,688 HKD
$725 USD
View
B+
Retailer 5
-
HK$6,002 HKD
$765 USD
View
A
Retailer 6
-
HK$6,945 HKD
€843 EUR
View
A
Retailer 7
-
HK$6,967 HKD
$888 USD
View
A
Retailer 8
-
HK$7,571 HKD
£760 GBP
View
B
Retailer 9
-
HK$13,189 HKD
$1,681 USD
View
B
Retailer 10
-
HK$14,602 HKD
SGD 2,515 SGD
View
Most Expensive
B
MOH London
LG639415932 · Nov 1
HK$16,909 HKD
£1,697 GBP
View
10 more retailers have this diamond
Prices start from HK$4,590 HKDSave up to HK$12,319 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
3.18ct Cushion
HK$4,590 HKD