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Round|Natural|GIA

1.64ct D SI2 Round Natural Diamond

EX • D/SI2 • GIA 5453378660

Certificate GIA 5453378660

Diamond specifications and retailer prices

From $17,043 AUD
$11,972 USD
As of October 31, 2026
Save $1,506 AUD (8%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: $18,550 AUD at Jared · As of October 30, 2026
View at Jared

About this 1.64ct natural round diamond

This 1.64ct natural round sits in the one-and-a-half to two carat band, graded D colour (colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 5453378660. Listed at 5 retailers as of October 30, 2026, with a relatively tight 9% spread, which is unusual at this carat range and suggests competitive pricing across the listings. 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
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle36.5°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 5453378660
Dimensions7.47 × 7.53 × 4.70 mm
L/W Ratio1.01
Star length50%
Lower girdle75%
Top View
7.47 mm7.53 mm1.64 ctD / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 5453378660
Side View
Table 56.0%Crown 36.5°Girdle: MED-STKPavilion 40.6°Culet: NoneDepth 62.7%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 31
Current: $18,550 AUD|Low: $17,043 AUD|High: $18,550 AUD|Avg: $17,926 AUD
Jared
Retailer 2
Retailer 3
Retailer 4
Retailer 5
October 29, 2026
Retailer 3$17,043 AUD
Retailer 4$17,952 AUD
Retailer 5$17,952 AUD
Retailer 2$18,220 AUD
Jared$18,550 AUD

22 data points across 5 retailers

5 retailers$17,043 AUD to $18,550 AUD

B+
Cheapest Retailer
-
$17,043 AUD
$11,972 USD
B+
Retailer 2
-
$17,952 AUD
$12,610 USD
View
B+
Retailer 3
-
$17,952 AUD
$12,610 USD
View
B+
Retailer 4
-
$18,220 AUD
€12,189 EUR
View
Most Expensive
B
Jared
146703431 · Oct 30
$18,550 AUD
$13,030 USD
View
4 more retailers have this diamond
Prices start from $17,043 AUDSave up to $1,506 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.

B+
1.64ct Round
$17,043 AUD