×
carat vs. color  length*  width*
  ×

(or examine a )
* size in mm (optional)

15ct Sapphire (Trillion, 18.03×18.03mm, Blue) vs 15ct Fluorite (Trillion, 19.46×19.46mm, Bluish Green)


Quick summary: When looked from above (face-up position), 15ct Fluorite (19.46×19.46mm, trillion cut) appears 16% larger than 15ct Sapphire (18.03×18.03mm, trillion cut). See below how they compare side-by-side on a ring and finger.

15ct Sapphire (trillion cut)
vs
 15ct Fluorite (trillion cut)
blue
 
bluish green
18.03×18.03 mm 19.46×19.46 mm
actual size
Actual size of 15ct Sapphire (trillion cut, 18.03×18.03mm, Blue color)   Actual size of 15ct Fluorite (trillion cut, 19.46×19.46mm, 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 (trillion cut, 18.03×18.03mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Bluish Green 15ct Fluorite (trillion cut, 19.46×19.46mm) 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
 107% vs 116%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 15ct Sapphire Trillion (18.03×18.03mm, Blue) and 15ct Fluorite Trillion (19.46×19.46mm, 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 (Trillion) 15 Ct Fluorite (Trillion)
18.03×18.03 mm vs 19.46×19.46 mm
201.55 mm²   234.79 mm²
Face-up size outline for 15ct Fluorite (19.46×19.46mm, trillion cut)
Face-up size outline for 15ct Sapphire (18.03×18.03mm, trillion cut)
15ct Sapphire Trillion (18.03×18.03mm)
15ct Fluorite Trillion (19.46×19.46mm)
Difference: 16% (33.24 mm²)
15ct Fluorite (Trillion, 19.46×19.46mm) has approx. 16% more face-up area than 15ct Sapphire (Trillion, 18.03×18.03mm).


Popular comparisons: