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Round|Natural|GIA

1.66ct F SI1 Round Natural Diamond

EX • F/SI1 • GIA 3485670120

Certificate GIA 3485670120

Diamond specifications and retailer prices

From $9,655 USD
As of November 1, 2026
Save $10,159 USD (51%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: $19,814 USD 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 $9,655 to $19,814, a $10,159 spread on the same certified stone. Diamond Quarter lists it at $19,814. 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: $12,700 USD|Low: $9,655 USD|High: $16,734 USD|Avg: $12,452 USD|+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$9,655 USD
Retailer 9$9,823 USD
Retailer 8$10,455 USD
Retailer 4$11,265 USD
Retailer 6$11,502 USD
Retailer 2$11,645 USD
Retailer 1$12,700 USD
Retailer 10$14,029 USD
Retailer 5$15,553 USD
Retailer 3$16,534 USD

44 data points across 10 retailers

17 retailers$9,655 USD to $19,814 USD

B+
Cheapest Retailer
-
$9,655 USD
B+
Retailer 2
-
$9,823 USD
View
B+
Retailer 3
-
$10,455 USD
View
B+
Retailer 4
-
$10,587 USD
View
B+
Retailer 5
-
$11,265 USD
£8,870 GBP
View
B+
Retailer 6
-
$11,469 USD
View
Retailer 7
-
$11,502 USD
A$17,695 AUD
View
Price last confirmed 9 days ago
B
Retailer 8
-
$11,645 USD
View
B
Retailer 9
-
$12,612 USD
View
B
Retailer 10
-
$12,700 USD
€12,095 EUR
View
B
Retailer 11
-
$13,233 USD
View
Retailer 12
-
$13,927 USD
View
Price last confirmed 10 days ago
Retailer 13
-
$14,029 USD
£11,046 GBP
View
Price last confirmed 33 days ago
B
Retailer 14
-
$15,553 USD
ZAR 251,261 ZAR
View
B
Retailer 15
-
$16,534 USD
£13,019 GBP
View
B
Retailer 16
-
$17,644 USD
View
Most Expensive
B
Diamond Quarter
1.66SI1F3420E2B1N · Nov 2
$19,814 USD
£15,602 GBP
View
16 more retailers have this diamond
Prices start from $9,655 USDSave up to $10,159 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.

B+
1.66ct Round
$9,655 USD