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12ct Kyanite (Cushion, 13.03×13.03mm, Blue) vs 12ct Sapphire (Cushion, 12.67×12.67mm, Blue)


Quick summary: When looked from above (face-up position), 12ct Kyanite (13.03×13.03mm, cushion cut) appears 6% larger than 12ct Sapphire (12.67×12.67mm, cushion cut). See below how they compare side-by-side on a ring and finger.

12ct Kyanite (cushion cut)
vs
 12ct Sapphire (cushion cut)
blue
 
blue
13.03×13.03 mm 12.67×12.67 mm
actual size
Actual size of 12ct Kyanite (cushion cut, 13.03×13.03mm, Blue color)   Actual size of 12ct Sapphire (cushion cut, 12.67×12.67mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 12ct Kyanite (cushion cut, 13.03×13.03mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 12ct Sapphire (cushion cut, 12.67×12.67mm) 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
 78% vs 75%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 12ct Kyanite Cushion (13.03×13.03mm, Blue) and 12ct Sapphire Cushion (12.67×12.67mm, 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.


12 Ct Kyanite (Cushion) 12 Ct Sapphire (Cushion)
13.03×13.03 mm vs 12.67×12.67 mm
152.8 mm²   144.48 mm²
Face-up size outline for 12ct Kyanite (13.03×13.03mm, cushion cut)
Face-up size outline for 12ct Sapphire (12.67×12.67mm, cushion cut)
12ct Kyanite Cushion (13.03×13.03mm)
12ct Sapphire Cushion (12.67×12.67mm)
Difference: 6% (8.32 mm²)
12ct Kyanite (Cushion, 13.03×13.03mm) has approx. 6% more face-up area than 12ct Sapphire (Cushion, 12.67×12.67mm).


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