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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 $833 AUD
$585 USD
As of October 31, 2026
Save $2,235 AUD (73%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $3,068 AUD 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 $833 to $3,068, a $2,235 spread on the same certified stone. MOH London lists it at $3,068. 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: $3,068 AUD|Low: $833 AUD|High: $3,896 AUD|Avg: $1,594 AUD|-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 3$833 AUD
Retailer 9$836 AUD
Retailer 8$911 AUD
Retailer 5$1,032 AUD
Retailer 6$1,089 AUD
Retailer 4$1,260 AUD
Retailer 7$1,264 AUD
Retailer 2$1,374 AUD
Retailer 10$2,393 AUD
Retailer 11$2,649 AUD
MOH London$3,068 AUD

43 data points across 11 retailers

11 retailers$833 AUD to $3,068 AUD

A
Cheapest Retailer
-
$833 AUD
$585 USD
Final sale: no returns
Retailer 2
-
$836 AUD
$587 USD
View
Price last confirmed 16 days ago
A
Retailer 3
-
$911 AUD
HK$5,000 HKD
View
A
Retailer 4
-
$1,032 AUD
$725 USD
View
B+
Retailer 5
-
$1,089 AUD
$765 USD
View
A
Retailer 6
-
$1,260 AUD
€843 EUR
View
A
Retailer 7
-
$1,264 AUD
$888 USD
View
A
Retailer 8
-
$1,374 AUD
£760 GBP
View
B
Retailer 9
-
$2,393 AUD
$1,681 USD
View
B
Retailer 10
-
$2,649 AUD
SGD 2,515 SGD
View
Most Expensive
B
MOH London
LG639415932 · Nov 1
$3,068 AUD
£1,697 GBP
View
10 more retailers have this diamond
Prices start from $833 AUDSave up to $2,235 AUD

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
$833 AUD