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20ct Sapphire (Cabochon, 18.57×12.38mm, Blue) vs 20ct Fluorite (Cabochon, 20.06×13.37mm, Bluish Green)


Quick summary: When looked from above (face-up position), 20ct Fluorite (20.06×13.37mm, cabochon cut) appears 17% larger than 20ct Sapphire (18.57×12.38mm, cabochon cut). See below how they compare side-by-side on a ring and finger.

20ct Sapphire (cabochon cut)
vs
 20ct Fluorite (cabochon cut)
blue
 
bluish green
18.57×12.38 mm 20.06×13.37 mm
actual size
Actual size of 20ct Sapphire (cabochon cut, 18.57×12.38mm, Blue color)   Actual size of 20ct Fluorite (cabochon cut, 20.06×13.37mm, Bluish Green color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 20ct Sapphire (cabochon cut, 18.57×12.38mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Bluish Green 20ct Fluorite (cabochon cut, 20.06×13.37mm) on a right ring and finger
Your settings
Ring
 Gold
Skin tone
 Light
Ring diameter
 16.9 mm
Ring width
 3.0 mm
Finger length
 64 mm
Finger coverage
 74% vs 80%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 20ct Sapphire Cabochon (18.57×12.38mm, Blue) and 20ct Fluorite Cabochon (20.06×13.37mm, Bluish Green) as they would appear on a ring and finger. Adjust the ring and finger size to get an idea of how these gemstones would look on your finger.

Where to buy?

For certified gemstones, high-end gemstone jewelry, and birthstone jewelry, see Blue Nile

Face-up Size

All things being equal, Sapphire will face-up smaller than Fluorite for a given carat weight, because it has higher specific gravity (4 vs. 3.18 - this means it's "heavier" compared to Fluorite of the same size). Face-up size also depends heavily on the proportions of the cut.

Face-up area is a measure of the size of the gem when viewed from above (as set in a ring). It tells you how big the gem is at the girdle plane.


20 Ct Sapphire (Cabochon) 20 Ct Fluorite (Cabochon)
18.57×12.38 mm vs 20.06×13.37 mm
188.52 mm²   219.93 mm²
Face-up size outline for 20ct Fluorite (20.06×13.37mm, cabochon cut)
Face-up size outline for 20ct Sapphire (18.57×12.38mm, cabochon cut)
20ct Sapphire Cabochon (18.57×12.38mm)
20ct Fluorite Cabochon (20.06×13.37mm)
Difference: 17% (31.41 mm²)
20ct Fluorite (Cabochon, 20.06×13.37mm) has approx. 17% more face-up area than 20ct Sapphire (Cabochon, 18.57×12.38mm).


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