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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 $1,038 NZD
$585 USD
As of November 1, 2026
Save $2,786 NZD (73%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $3,824 NZD 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 November 1, 2026, with prices from $1,038 to $3,824, a $2,786 spread on the same certified stone. MOH London lists it at $3,824. 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

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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: Nov 1
Current: $3,824 NZD|Low: $1,038 NZD|High: $4,856 NZD|Avg: $1,988 NZD|-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 2, 2026
Retailer 3$1,038 NZD
Retailer 9$1,042 NZD
Retailer 8$1,136 NZD
Retailer 5$1,286 NZD
Retailer 6$1,357 NZD
Retailer 4$1,571 NZD
Retailer 7$1,576 NZD
Retailer 2$1,712 NZD
Retailer 10$2,983 NZD
Retailer 11$3,302 NZD
MOH London$3,824 NZD

44 data points across 11 retailers

11 retailers$1,038 NZD to $3,824 NZD

A
Cheapest Retailer
-
$1,038 NZD
$585 USD
Final sale: no returns
Retailer 2
-
$1,042 NZD
$587 USD
View
Price last confirmed 16 days ago
A
Retailer 3
-
$1,136 NZD
HK$5,000 HKD
View
A
Retailer 4
-
$1,286 NZD
$725 USD
View
B+
Retailer 5
-
$1,357 NZD
$765 USD
View
A
Retailer 6
-
$1,571 NZD
€843 EUR
View
A
Retailer 7
-
$1,576 NZD
$888 USD
View
A
Retailer 8
-
$1,712 NZD
£760 GBP
View
B
Retailer 9
-
$2,983 NZD
$1,681 USD
View
B
Retailer 10
-
$3,302 NZD
SGD 2,515 SGD
View
Most Expensive
B
MOH London
LG639415932 · Nov 1
$3,824 NZD
£1,697 GBP
View
10 more retailers have this diamond
Prices start from $1,038 NZDSave up to $2,786 NZD

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
$1,038 NZD