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18ct Kyanite (Trillion, 19.7×19.7mm, Blue) vs 18ct Sapphire (Trillion, 19.16×19.16mm, Blue)


Quick summary: When looked from above (face-up position), 18ct Kyanite (19.7×19.7mm, trillion cut) appears 6% larger than 18ct Sapphire (19.16×19.16mm, trillion cut). See below how they compare side-by-side on a ring and finger.

18ct Kyanite (trillion cut)
vs
 18ct Sapphire (trillion cut)
blue
 
blue
19.7×19.7 mm 19.16×19.16 mm
actual size
Actual size of 18ct Kyanite (trillion cut, 19.7×19.7mm, Blue color)   Actual size of 18ct Sapphire (trillion cut, 19.16×19.16mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 18ct Kyanite (trillion cut, 19.7×19.7mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 18ct Sapphire (trillion cut, 19.16×19.16mm) 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
 117% vs 114%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 18ct Kyanite Trillion (19.7×19.7mm, Blue) and 18ct Sapphire Trillion (19.16×19.16mm, 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.


18 Ct Kyanite (Trillion) 18 Ct Sapphire (Trillion)
19.7×19.7 mm vs 19.16×19.16 mm
240.62 mm²   227.61 mm²
Face-up size outline for 18ct Kyanite (19.7×19.7mm, trillion cut)
Face-up size outline for 18ct Sapphire (19.16×19.16mm, trillion cut)
18ct Kyanite Trillion (19.7×19.7mm)
18ct Sapphire Trillion (19.16×19.16mm)
Difference: 6% (13.01 mm²)
18ct Kyanite (Trillion, 19.7×19.7mm) has approx. 6% more face-up area than 18ct Sapphire (Trillion, 19.16×19.16mm).


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