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15ct Sapphire (Cabochon, 16.88×11.25mm, Blue) vs 15ct Fluorite (Cabochon, 18.23×12.15mm, Bluish Green)


Quick summary: When looked from above (face-up position), 15ct Fluorite (18.23×12.15mm, cabochon cut) appears 17% larger than 15ct Sapphire (16.88×11.25mm, cabochon cut). See below how they compare side-by-side on a ring and finger.

15ct Sapphire (cabochon cut)
vs
 15ct Fluorite (cabochon cut)
blue
 
bluish green
16.88×11.25 mm 18.23×12.15 mm
actual size
Actual size of 15ct Sapphire (cabochon cut, 16.88×11.25mm, Blue color)   Actual size of 15ct Fluorite (cabochon cut, 18.23×12.15mm, 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 (cabochon cut, 16.88×11.25mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Bluish Green 15ct Fluorite (cabochon cut, 18.23×12.15mm) 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
 67% vs 72%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 15ct Sapphire Cabochon (16.88×11.25mm, Blue) and 15ct Fluorite Cabochon (18.23×12.15mm, 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 (Cabochon) 15 Ct Fluorite (Cabochon)
16.88×11.25 mm vs 18.23×12.15 mm
155.72 mm²   181.63 mm²
Face-up size outline for 15ct Fluorite (18.23×12.15mm, cabochon cut)
Face-up size outline for 15ct Sapphire (16.88×11.25mm, cabochon cut)
15ct Sapphire Cabochon (16.88×11.25mm)
15ct Fluorite Cabochon (18.23×12.15mm)
Difference: 17% (25.91 mm²)
15ct Fluorite (Cabochon, 18.23×12.15mm) has approx. 17% more face-up area than 15ct Sapphire (Cabochon, 16.88×11.25mm).


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