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1.66ct F SI1 Round Natural Diamond

EX • F/SI1 • GIA 3485670120

Certificate GIA 3485670120

Diamond specifications and retailer prices

From €8,608 EUR
$9,655 USD
As of November 1, 2026
Save €9,058 EUR (51%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: €17,666 EUR at Diamond Quarter · As of November 2, 2026
View at Diamond Quarter

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 3485670120. Listed at 17 retailers as of November 1, 2026, with prices from €8,608 to €17,666, a €9,058 spread on the same certified stone. Diamond Quarter lists it at €17,666. 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
FluorescenceNone
Crown angle35°
Pavilion angle41.4°
OriginNatural
Grading LabGIA
CertificateGIA 3485670120
Dimensions7.58 × 7.54 × 4.72 mm
L/W Ratio1.01
Star length50%
Lower girdle75%
Top View
7.58 mm7.54 mm1.66 ctF / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 3485670120
Side View
Table 59.0%Crown 35°Girdle: ThinPavilion 41.4°Culet: NoneDepth 62.4%

Caratlytics Score

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

Price History

Last verified: Nov 1
Current: €11,323 EUR|Low: €8,608 EUR|High: €14,919 EUR|Avg: €11,102 EUR|+3.5%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 1, 2026
Retailer 7€8,608 EUR
Retailer 9€8,758 EUR
Retailer 8€9,321 EUR
Retailer 4€10,043 EUR
Retailer 6€10,255 EUR
Retailer 2€10,382 EUR
Retailer 1€11,323 EUR
Retailer 10€12,508 EUR
Retailer 5€13,867 EUR
Retailer 3€14,741 EUR

44 data points across 10 retailers

17 retailers€8,608 EUR to €17,666 EUR

B+
Cheapest Retailer
-
€8,608 EUR
$9,655 USD
B+
Retailer 2
-
€8,758 EUR
$9,823 USD
View
B+
Retailer 3
-
€9,321 EUR
$10,455 USD
View
B+
Retailer 4
-
€9,439 EUR
$10,587 USD
View
B+
Retailer 5
-
€10,043 EUR
£8,870 GBP
View
B+
Retailer 6
-
€10,226 EUR
$11,469 USD
View
Retailer 7
-
€10,255 EUR
A$17,695 AUD
View
Price last confirmed 9 days ago
B
Retailer 8
-
€10,382 EUR
$11,645 USD
View
B
Retailer 9
-
€11,244 EUR
$12,612 USD
View
B
Retailer 10
-
€11,323 EUR
View
B
Retailer 11
-
€11,798 EUR
$13,233 USD
View
Retailer 12
-
€12,417 EUR
$13,927 USD
View
Price last confirmed 10 days ago
Retailer 13
-
€12,508 EUR
£11,046 GBP
View
Price last confirmed 33 days ago
B
Retailer 14
-
€13,867 EUR
ZAR 251,261 ZAR
View
B
Retailer 15
-
€14,741 EUR
£13,019 GBP
View
B
Retailer 16
-
€15,731 EUR
$17,644 USD
View
Most Expensive
B
Diamond Quarter
1.66SI1F3420E2B1N · Nov 2
€17,666 EUR
£15,602 GBP
View
16 more retailers have this diamond
Prices start from €8,608 EURSave up to €9,058 EUR

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
€8,608 EUR