Round|Natural|GIA

1.66ct F SI1 Round Natural Diamond

EX • F/SI1 • GIA 2527864094

Certificate GIA 2527864094

Diamond specifications and retailer prices

From $6,721 USD
As of November 1, 2026
Save $5,646 USD (46%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: $12,367 USD at NZ Jewellers · As of November 2, 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 F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2527864094. Listed at 5 retailers as of November 1, 2026, with prices from $6,721 to $12,367, a $5,646 spread on the same certified stone. NZ Jewellers lists it at $12,367. 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
F
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceStrong
Crown angle36.5°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 2527864094
Dimensions7.52 × 7.56 × 4.76 mm
L/W Ratio1.01
Star length50%
Top View
7.52 mm7.56 mm1.66 ctF / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceStrong
CertificateGIA 2527864094
Side View
Table 56.0%Crown 36.5°Girdle: MED-STKPavilion 41°Culet: NoneDepth 63.1%

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 1
Current: $12,367 USD|Low: $5,414 USD|High: $12,367 USD|Avg: $8,684 USD
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
November 2, 2026
Retailer 5$6,721 USD
Retailer 4$6,825 USD
Retailer 3$7,682 USD
Retailer 2$10,305 USD
NZ Jewellers$12,367 USD

26 data points across 5 retailers

5 retailers$6,721 USD to $12,367 USD

A
Cheapest Retailer
-
$6,721 USD
A
Retailer 2
-
$6,825 USD
View
Final sale: no returns
A
Retailer 3
-
$7,682 USD
€7,316 EUR
View
B+
Retailer 4
-
$10,305 USD
£8,114 GBP
View
Most Expensive
B
NZ Jewellers
f59a4fad-3800-4c82-843e-e73e64f48f00 · Nov 2
$12,367 USD
View
4 more retailers have this diamond
Prices start from $6,721 USDSave up to $5,646 USD

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
$6,721 USD