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12ct Kyanite (Oval, 18.05×12.03mm, Blue) vs 12ct Sapphire (Oval, 17.55×11.7mm, Blue)


Quick summary: When looked from above (face-up position), 12ct Kyanite (18.05×12.03mm, oval cut) appears 6% larger than 12ct Sapphire (17.55×11.7mm, oval cut). See below how they compare side-by-side on a ring and finger.

12ct Kyanite (oval cut)
vs
 12ct Sapphire (oval cut)
blue
 
blue
18.05×12.03 mm 17.55×11.7 mm
actual size
Actual size of 12ct Kyanite (oval cut, 18.05×12.03mm, Blue color)   Actual size of 12ct Sapphire (oval cut, 17.55×11.7mm, 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 (oval cut, 18.05×12.03mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 12ct Sapphire (oval cut, 17.55×11.7mm) 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
 72% vs 70%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 12ct Kyanite Oval (18.05×12.03mm, Blue) and 12ct Sapphire Oval (17.55×11.7mm, 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 (Oval) 12 Ct Sapphire (Oval)
18.05×12.03 mm vs 17.55×11.7 mm
178.06 mm²   168.37 mm²
Face-up size outline for 12ct Kyanite (18.05×12.03mm, oval cut)
Face-up size outline for 12ct Sapphire (17.55×11.7mm, oval cut)
12ct Kyanite Oval (18.05×12.03mm)
12ct Sapphire Oval (17.55×11.7mm)
Difference: 6% (9.69 mm²)
12ct Kyanite (Oval, 18.05×12.03mm) has approx. 6% more face-up area than 12ct Sapphire (Oval, 17.55×11.7mm).


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