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Round|Natural|GIA

1.66ct M SI1 Round Natural Diamond

EX • M/SI1 • GIA 2547765261

Certificate GIA 2547765261

Diamond specifications and retailer prices

From $3,540 AUD
As of November 4, 2026
Save $4,582 AUD (56%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $8,267 AUD at NZ Jewellers · As of October 23, 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 M colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2547765261. Listed at 13 retailers as of November 4, 2026, with a 129% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
M
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle36°
Pavilion angle41.2°
OriginNatural
Grading LabGIA
CertificateGIA 2547765261
Dimensions7.53 × 7.58 × 4.71 mm
L/W Ratio1.01
Top View
7.53 mm7.58 mm1.66 ctM / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 2547765261
Side View
Table 58.0%Crown 36°Girdle: MediumPavilion 41.2°Culet: NoneDepth 62.3%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 4
Current: $8,121 AUD|Low: $3,483 AUD|High: $8,651 AUD|Avg: $5,366 AUD|-6.1%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 6, 2026
Retailer 11$3,540 AUD
Retailer 3$3,900 AUD
Retailer 8$4,302 AUD
Retailer 10$4,519 AUD
Retailer 4$4,775 AUD
Retailer 12$4,781 AUD
Retailer 2$5,075 AUD
Retailer 7$5,159 AUD
Retailer 5$5,416 AUD
Retailer 6$5,689 AUD
Retailer 9$7,294 AUD
NZ Jewellers$8,121 AUD

38 data points across 12 retailers

13 retailers$3,540 AUD to $8,121 AUD

A
Cheapest Retailer
-
$3,540 AUD
Retailer 2
-
$3,900 AUD
View
Price last confirmed 16 days ago
A
Retailer 3
-
$4,302 AUD
View
Final sale: no returns
B+
Retailer 4
-
$4,519 AUD
View
B+
Retailer 5
-
$4,775 AUD
View
B+
Retailer 6
-
$4,781 AUD
View
B+
Retailer 7
-
$5,075 AUD
View
B+
Retailer 8
-
$5,159 AUD
View
B+
Retailer 9
-
$5,416 AUD
View
B+
Retailer 10
-
$5,689 AUD
View
B
Retailer 11
-
$7,294 AUD
View
B
Retailer 12
-
$8,121 AUD
View
Most Expensive
NZ Jewellers
c3dc410e-7922-4c5e-aaf1-a752583d0752 · Oct 23
$8,267 AUD
$5,680 USD
View
Price last confirmed 14 days ago
12 more retailers have this diamond
Prices start from $3,540 AUDSave up to $4,582 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
1.66ct Round
$3,540 AUD