Round|Natural|GIA

1.66ct N SI1 Round Natural Diamond

EX • N/SI1 • GIA 6491894561

Shape and cutting style on the report: Round

Certificate GIA 6491894561

Diamond specifications and retailer prices

From $5,269 AUD
As of November 6, 2026
7 retailers carry this diamond
Most expensive: $11,065 AUD at NZ Jewellers · As of September 27, 2026
View at NZ Jewellers

About this 1.66ct natural round diamond

This 1.66ct natural round sits in the one-and-a-half to two carat band, graded N colour (tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6491894561. Listed at 7 retailers as of November 6, 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

1.66
Carat
N
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 6491894561
Dimensions7.49 × 7.53 × 4.73 mm
L/W Ratio1.01
Star length50%
Lower girdle75%
Top View
7.49 mm7.53 mm1.66 ctN / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6491894561
Side View
Table 56.0%Crown 35°Girdle: Slightly ThickPavilion 41°CuletDepth 62.9%

Caratlytics Score

How it works →
B
Good
Decent quality, room for better deals
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: $5,269 AUD|Low: $5,116 AUD|High: $8,866 AUD|Avg: $6,893 AUD
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
October 8, 2026
Retailer 1$5,269 AUD
Retailer 3$5,494 AUD
Retailer 5$5,740 AUD
Retailer 2$7,127 AUD
Retailer 4$7,658 AUD
Retailer 6$8,612 AUD
Retailer 7$8,866 AUD

11 data points across 7 retailers

7 retailers

B
Cheapest Retailer
-
$5,269 AUD
Retailer 2
-
$5,755 AUD
View
Price last confirmed 29 days ago
Retailer 3
-
$5,755 AUD
View
Price last confirmed 29 days ago
Retailer 4
-
$5,755 AUD
View
Price last confirmed 38 days ago
Retailer 5
-
$6,640 AUD
View
Price last confirmed 38 days ago
Retailer 6
-
$7,658 AUD
View
Price last confirmed 37 days ago
Most Expensive
NZ Jewellers
b01716da-7062-4bd9-9c9a-46ea4c0a3053 · Sep 27
$11,065 AUD
$7,603 USD
View
Price last confirmed 40 days ago
6 more retailers have this diamond
Prices start from $5,269 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
1.66ct Round
$5,269 AUD