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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 $3,117 SGD
As of November 4, 2026
Save $4,034 SGD (56%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $7,279 SGD 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
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 4
Current: $7,151 SGD|Low: $3,067 SGD|High: $7,618 SGD|Avg: $4,725 SGD|-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$3,117 SGD
Retailer 3$3,435 SGD
Retailer 8$3,788 SGD
Retailer 10$3,979 SGD
Retailer 4$4,205 SGD
Retailer 12$4,210 SGD
Retailer 2$4,469 SGD
Retailer 7$4,543 SGD
Retailer 5$4,769 SGD
Retailer 6$5,010 SGD
Retailer 9$6,423 SGD
NZ Jewellers$7,151 SGD

38 data points across 12 retailers

13 retailers$3,117 SGD to $7,151 SGD

A
Cheapest Retailer
-
$3,117 SGD
Retailer 2
-
$3,435 SGD
View
Price last confirmed 16 days ago
A
Retailer 3
-
$3,788 SGD
View
Final sale: no returns
B+
Retailer 4
-
$3,979 SGD
View
B+
Retailer 5
-
$4,205 SGD
View
B+
Retailer 6
-
$4,210 SGD
View
B+
Retailer 7
-
$4,469 SGD
View
B+
Retailer 8
-
$4,543 SGD
View
B+
Retailer 9
-
$4,769 SGD
View
B+
Retailer 10
-
$5,010 SGD
View
B
Retailer 11
-
$6,423 SGD
View
B
Retailer 12
-
$7,151 SGD
View
Most Expensive
NZ Jewellers
c3dc410e-7922-4c5e-aaf1-a752583d0752 · Oct 23
$7,279 SGD
$5,680 USD
View
Price last confirmed 14 days ago
12 more retailers have this diamond
Prices start from $3,117 SGDSave up to $4,034 SGD

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
$3,117 SGD