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Cushion|Lab Grown|IGI

1.64ct F SI1 Cushion Lab Grown Diamond

ID • F/SI1 • IGI LG648438969

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG648438969

Diamond specifications and retailer prices

From $621 AUD
$435 USD
As of October 25, 2026
4 retailers carry this diamond
Most expensive: $1,612 AUD at Brilliant Earth · As of October 26, 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 F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG648438969 or 648438969. Listed at 4 retailers as of October 25, 2026. 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
F
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.6°
Pavilion angle40.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG648438969
Dimensions6.84 × 6.79 × 4.63 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
6.84 mm6.79 mm1.64 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG648438969
Side View
Table 60.0%Crown 34.6°Girdle: THN-MEDPavilion 40.6°Culet: NoneDepth 68.2%

Caratlytics Score

No score right now
No retailer has confirmed this stone recently, so we are not scoring it. Prices below are as of the date shown.

Price History

Last verified: Oct 25
Current: $1,612 AUD|Low: $214 AUD|High: $2,811 AUD|Avg: $1,363 AUD|-3.4%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
October 25, 2026
Retailer 6$327 AUD
Retailer 4$621 AUD
Retailer 5$1,226 AUD
Retailer 2$1,587 AUD
Brilliant Earth$1,612 AUD
Retailer 3$2,768 AUD

11 data points across 6 retailers

4 retailers$621 AUD to $1,612 AUD

Retailer 1
-
$621 AUD
$435 USD
Price last confirmed 8 days ago
Retailer 2
-
$1,226 AUD
$859 USD
View
Price last confirmed 7 days ago
Retailer 3
-
$1,587 AUD
£876 GBP
View
Price last confirmed 7 days ago
Most Expensive
Brilliant Earth
13555009Y · Oct 26
$1,612 AUD
$1,130 USD
View
Price last confirmed 7 days ago
3 more retailers have this diamond

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.

1.64ct Cushion
$621 AUD