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17ct Sapphire (Trillion, 18.8×18.8mm, Blue) vs 17ct Fluorite (Trillion, 20.29×20.29mm, Bluish Green)


Quick summary: When looked from above (face-up position), 17ct Fluorite (20.29×20.29mm, trillion cut) appears 16% larger than 17ct Sapphire (18.8×18.8mm, trillion cut). See below how they compare side-by-side on a ring and finger.

17ct Sapphire (trillion cut)
vs
 17ct Fluorite (trillion cut)
blue
 
bluish green
18.8×18.8 mm 20.29×20.29 mm
actual size
Actual size of 17ct Sapphire (trillion cut, 18.8×18.8mm, Blue color)   Actual size of 17ct Fluorite (trillion cut, 20.29×20.29mm, 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 17ct Sapphire (trillion cut, 18.8×18.8mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Bluish Green 17ct Fluorite (trillion cut, 20.29×20.29mm) 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
 112% vs 121%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 17ct Sapphire Trillion (18.8×18.8mm, Blue) and 17ct Fluorite Trillion (20.29×20.29mm, 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.


17 Ct Sapphire (Trillion) 17 Ct Fluorite (Trillion)
18.8×18.8 mm vs 20.29×20.29 mm
219.13 mm²   255.24 mm²
Face-up size outline for 17ct Fluorite (20.29×20.29mm, trillion cut)
Face-up size outline for 17ct Sapphire (18.8×18.8mm, trillion cut)
17ct Sapphire Trillion (18.8×18.8mm)
17ct Fluorite Trillion (20.29×20.29mm)
Difference: 16% (36.11 mm²)
17ct Fluorite (Trillion, 20.29×20.29mm) has approx. 16% more face-up area than 17ct Sapphire (Trillion, 18.8×18.8mm).


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