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15ct Kyanite (Trillion, 18.54×18.54mm, Blue) vs 15ct Sapphire (Trillion, 18.03×18.03mm, Blue)


Quick summary: When looked from above (face-up position), 15ct Kyanite (18.54×18.54mm, trillion cut) appears 6% larger than 15ct Sapphire (18.03×18.03mm, trillion cut). See below how they compare side-by-side on a ring and finger.

15ct Kyanite (trillion cut)
vs
 15ct Sapphire (trillion cut)
blue
 
blue
18.54×18.54 mm 18.03×18.03 mm
actual size
Actual size of 15ct Kyanite (trillion cut, 18.54×18.54mm, Blue color)   Actual size of 15ct Sapphire (trillion cut, 18.03×18.03mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 15ct Kyanite (trillion cut, 18.54×18.54mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 15ct Sapphire (trillion cut, 18.03×18.03mm) 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
 110% vs 107%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 15ct Kyanite Trillion (18.54×18.54mm, Blue) and 15ct Sapphire Trillion (18.03×18.03mm, Blue) 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 Kyanite for a given carat weight, because it has higher specific gravity (4 vs. 3.68 - this means it's "heavier" compared to Kyanite 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 Kyanite (Trillion) 15 Ct Sapphire (Trillion)
18.54×18.54 mm vs 18.03×18.03 mm
213.11 mm²   201.55 mm²
Face-up size outline for 15ct Kyanite (18.54×18.54mm, trillion cut)
Face-up size outline for 15ct Sapphire (18.03×18.03mm, trillion cut)
15ct Kyanite Trillion (18.54×18.54mm)
15ct Sapphire Trillion (18.03×18.03mm)
Difference: 6% (11.56 mm²)
15ct Kyanite (Trillion, 18.54×18.54mm) has approx. 6% more face-up area than 15ct Sapphire (Trillion, 18.03×18.03mm).


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