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8ct Kyanite (Trillion, 15.03×15.03mm, Blue) vs 8ct Benitoite (Trillion, 15.07×15.07mm, Blue)


Quick summary: When looked from above (face-up position), 8ct Benitoite (15.07×15.07mm, trillion cut) appears 0.5% larger than 8ct Kyanite (15.03×15.03mm, trillion cut). See below how they compare side-by-side on a ring and finger.

8ct Kyanite (trillion cut)
vs
 8ct Benitoite (trillion cut)
blue
 
blue
15.03×15.03 mm 15.07×15.07 mm
actual size
Actual size of 8ct Kyanite (trillion cut, 15.03×15.03mm, Blue color)   Actual size of 8ct Benitoite (trillion cut, 15.07×15.07mm, Blue color)
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 8ct Kyanite (trillion cut, 15.03×15.03mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 8ct Benitoite (trillion cut, 15.07×15.07mm) 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
 89% vs 90%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 8ct Kyanite Trillion (15.03×15.03mm, Blue) and 8ct Benitoite Trillion (15.07×15.07mm, 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, Kyanite will face-up slightly smaller than Benitoite for a given carat weight, because it has higher specific gravity (3.68 vs. 3.65 - this means it's "slightly heavier" compared to Benitoite 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.


8 Ct Kyanite (Trillion) 8 Ct Benitoite (Trillion)
15.03×15.03 mm vs 15.07×15.07 mm
140.06 mm²   140.81 mm²
Face-up size outline for 8ct Benitoite (15.07×15.07mm, trillion cut)
Face-up size outline for 8ct Kyanite (15.03×15.03mm, trillion cut)
8ct Kyanite Trillion (15.03×15.03mm)
8ct Benitoite Trillion (15.07×15.07mm)
Difference: 0.5% (0.75 mm²)
8ct Benitoite (Trillion, 15.07×15.07mm) has approx. 0.5% more face-up area than 8ct Kyanite (Trillion, 15.03×15.03mm).


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