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Cushion|Lab Grown|IGI

1.64ct D SI1 Cushion Lab Grown Diamond

ID • D/SI1 • IGI LG526266176

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG526266176

Diamond specifications and retailer prices

From $426 AUD
$299 USD
As of October 30, 2026
Save $1,696 AUD (80%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $2,121 AUD at Brilliant Earth · As of October 30, 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 LG526266176 or 526266176. Listed at 13 retailers as of October 30, 2026, with prices from $426 to $2,121, a $1,696 spread on the same certified stone. Brilliant Earth lists it at $2,121. 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 angle35.7°
Pavilion angle39.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG526266176
Dimensions6.98 × 6.76 × 4.43 mm
L/W Ratio1.03
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
6.98 mm6.76 mm1.64 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG526266176
Side View
Table 65.5%Crown 35.7°Girdle: MED-VTKPavilion 39.3°Culet: NoneDepth 65.5%

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 30
Current: $2,121 AUD|Low: $302 AUD|High: $3,032 AUD|Avg: $1,105 AUD|-30.0%
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 31, 2026
Retailer 13$426 AUD
Retailer 11$471 AUD
Retailer 12$629 AUD
Retailer 8$634 AUD
Retailer 4$839 AUD
Retailer 6$845 AUD
Retailer 3$851 AUD
Retailer 2$895 AUD
Retailer 10$1,190 AUD
Retailer 9$1,530 AUD
Retailer 5$1,586 AUD
Retailer 7$1,897 AUD
Brilliant Earth$2,121 AUD

43 data points across 13 retailers

13 retailers$426 AUD to $2,121 AUD

A
Cheapest Retailer
-
$426 AUD
$299 USD
Final sale: no returns
A
Retailer 2
-
$471 AUD
$331 USD
View
B+
Retailer 3
-
$629 AUD
$442 USD
View
A
Retailer 4
-
$634 AUD
$445 USD
View
A
Retailer 5
-
$839 AUD
$589 USD
View
A
Retailer 6
-
$845 AUD
€565 EUR
View
A
Retailer 7
-
$851 AUD
$598 USD
View
A
Retailer 8
-
$895 AUD
£495 GBP
View
B+
Retailer 9
-
$1,190 AUD
$836 USD
View
Retailer 10
-
$1,530 AUD
$1,075 USD
View
Price last confirmed 9 days ago
B
Retailer 11
-
$1,586 AUD
$1,114 USD
View
B
Retailer 12
-
$1,897 AUD
£1,049 GBP
View
Most Expensive
B
Brilliant Earth
11226038A · Oct 30
$2,121 AUD
$1,490 USD
View
12 more retailers have this diamond
Prices start from $426 AUDSave up to $1,696 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
1.64ct Cushion
$426 AUD