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Cushion|Lab Grown|IGI

1.64ct D SI1 Cushion Lab Grown Diamond

ID • D/SI1 • IGI LG526288476

Shape and cutting style on the report: Cushion brilliant

Certificate IGI LG526288476

Diamond specifications and retailer prices

From $399 NZD
$225 USD
As of October 30, 2026
Save $2,227 NZD (85%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $2,626 NZD at Brilliant Earth · As of October 29, 2026
View at Brilliant Earth

About this 1.64ct lab-grown cushion diamond

This 1.64ct lab-grown cushion sits in the one-and-a-half to two carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG526288476 or 526288476. Listed at 13 retailers as of October 29, 2026, with prices from $399 to $2,626, a $2,227 spread on the same certified stone. Brilliant Earth lists it at $2,626. 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

1.64
Carat
D
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.9°
Pavilion angle29.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG526288476
Dimensions7.64 × 6.14 × 4.03 mm
L/W Ratio1.24
Girdle conditionFaceted
Culet sizePointed
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
7.64 mm6.14 mm1.64 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG526288476
Side View
Table 61.5%Crown 34.9°Girdle: MED-STKPavilion 29.2°Culet: NoneDepth 65.6%

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 30
Current: $2,626 NZD|Low: $399 NZD|High: $2,786 NZD|Avg: $1,206 NZD|-5.7%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 31, 2026
Retailer 9$399 NZD
Retailer 6$600 NZD
Retailer 2$725 NZD
Retailer 3$813 NZD
Retailer 10$896 NZD
Retailer 8$1,040 NZD
Retailer 4$1,072 NZD
Retailer 7$1,854 NZD
Retailer 5$2,082 NZD
Brilliant Earth$2,626 NZD

43 data points across 10 retailers

13 retailers$399 NZD to $2,626 NZD

A
Cheapest Retailer
-
$399 NZD
$225 USD
Final sale: no returns
B+
Retailer 2
-
$600 NZD
$338 USD
View
A
Retailer 3
-
$725 NZD
€389 EUR
View
A
Retailer 4
-
$813 NZD
£361 GBP
View
A
Retailer 5
-
$896 NZD
$505 USD
View
A
Retailer 6
-
$1,004 NZD
$566 USD
View
A
Retailer 7
-
$1,040 NZD
$586 USD
View
A
Retailer 8
-
$1,072 NZD
$604 USD
View
B+
Retailer 9
-
$1,519 NZD
$856 USD
View
Retailer 10
-
$1,854 NZD
$1,045 USD
View
Price last confirmed 10 days ago
B
Retailer 11
-
$2,082 NZD
£924 GBP
View
B
Retailer 12
-
$2,125 NZD
$1,198 USD
View
Most Expensive
B
Brilliant Earth
10788641A · Oct 29
$2,626 NZD
$1,480 USD
View
12 more retailers have this diamond
Prices start from $399 NZDSave up to $2,227 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
1.64ct Cushion
$399 NZD