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19ct Kyanite (Cabochon, 18.78×12.52mm, Blue) vs 19ct Sapphire (Cabochon, 18.26×12.17mm, Blue)


Quick summary: When looked from above (face-up position), 19ct Kyanite (18.78×12.52mm, cabochon cut) appears 6% larger than 19ct Sapphire (18.26×12.17mm, cabochon cut). See below how they compare side-by-side on a ring and finger.

19ct Kyanite (cabochon cut)
vs
 19ct Sapphire (cabochon cut)
blue
 
blue
18.78×12.52 mm 18.26×12.17 mm
actual size
Actual size of 19ct Kyanite (cabochon cut, 18.78×12.52mm, Blue color)   Actual size of 19ct Sapphire (cabochon cut, 18.26×12.17mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 19ct Kyanite (cabochon cut, 18.78×12.52mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 19ct Sapphire (cabochon cut, 18.26×12.17mm) 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
 75% vs 73%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 19ct Kyanite Cabochon (18.78×12.52mm, Blue) and 19ct Sapphire Cabochon (18.26×12.17mm, 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.


19 Ct Kyanite (Cabochon) 19 Ct Sapphire (Cabochon)
18.78×12.52 mm vs 18.26×12.17 mm
192.8 mm²   182.22 mm²
Face-up size outline for 19ct Kyanite (18.78×12.52mm, cabochon cut)
Face-up size outline for 19ct Sapphire (18.26×12.17mm, cabochon cut)
19ct Kyanite Cabochon (18.78×12.52mm)
19ct Sapphire Cabochon (18.26×12.17mm)
Difference: 6% (10.58 mm²)
19ct Kyanite (Cabochon, 18.78×12.52mm) has approx. 6% more face-up area than 19ct Sapphire (Cabochon, 18.26×12.17mm).


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