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1.66ct F SI1 Round Natural Diamond

EX • F/SI1 • GIA 2518514208

Certificate GIA 2518514208

Diamond specifications and retailer prices

From €18,867 EUR
£16,663 GBP
As of November 2, 2026
1 retailer carries this diamond
Only listing: €18,867 EUR at Diamond Quarter
Only one retailer lists this diamond right now, and it is shown above, so there is nothing to unlock. Similar diamonds are carried by several retailers.
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 2518514208. Listed at a single retailer as of November 2, 2026. If it later appears at another store, Carat Hunter will surface the price comparison automatically. 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 angle34.5°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 2518514208
Dimensions7.63 × 7.59 × 4.64 mm
L/W Ratio1.01
Culet sizeNone
Key to symbols
Cloud, Crystal, Feather, Needle
Top View
7.63 mm7.59 mm1.66 ctF / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2518514208
Side View
Table 59.0%Crown 34.5°Girdle: MED-STKPavilion 40.8°CuletDepth 61.0%

Caratlytics Score

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B
Good
Decent quality, room for better deals
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Price History

Last verified: Nov 2
Current: €18,867 EUR|Low: €18,867 EUR|High: €18,867 EUR|Avg: €18,867 EUR
September 26, 2026
Diamond Quarter€18,867 EUR

1 data point across 1 retailer

1 retailer

B
Diamond Quarter
1.66SI1F25086212M · Nov 2
€18,867 EUR
£16,663 GBP
View

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
€18,867 EUR