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15ct Sapphire (Oval, 18.92×12.61mm, Blue) vs 15ct Fluorite (Oval, 20.42×13.61mm, Bluish Green)


Quick summary: When looked from above (face-up position), 15ct Fluorite (20.42×13.61mm, oval cut) appears 16% larger than 15ct Sapphire (18.92×12.61mm, oval cut). See below how they compare side-by-side on a ring and finger.

15ct Sapphire (oval cut)
vs
 15ct Fluorite (oval cut)
blue
 
bluish green
18.92×12.61 mm 20.42×13.61 mm
actual size
Actual size of 15ct Sapphire (oval cut, 18.92×12.61mm, Blue color)   Actual size of 15ct Fluorite (oval cut, 20.42×13.61mm, 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 15ct Sapphire (oval cut, 18.92×12.61mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Bluish Green 15ct Fluorite (oval cut, 20.42×13.61mm) 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
 75% vs 81%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 15ct Sapphire Oval (18.92×12.61mm, Blue) and 15ct Fluorite Oval (20.42×13.61mm, 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.


15 Ct Sapphire (Oval) 15 Ct Fluorite (Oval)
18.92×12.61 mm vs 20.42×13.61 mm
195.64 mm²   227.89 mm²
Face-up size outline for 15ct Fluorite (20.42×13.61mm, oval cut)
Face-up size outline for 15ct Sapphire (18.92×12.61mm, oval cut)
15ct Sapphire Oval (18.92×12.61mm)
15ct Fluorite Oval (20.42×13.61mm)
Difference: 16% (32.25 mm²)
15ct Fluorite (Oval, 20.42×13.61mm) has approx. 16% more face-up area than 15ct Sapphire (Oval, 18.92×12.61mm).


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