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8ct Kyanite (Marquise, 20×10mm, Blue) vs 8ct Benitoite (Marquise, 20.04×10.02mm, Blue)


Quick summary: When looked from above (face-up position), 8ct Benitoite (20.04×10.02mm, marquise cut) appears 0.4% larger than 8ct Kyanite (20×10mm, marquise cut). See below how they compare side-by-side on a ring and finger.

8ct Kyanite (marquise cut)
vs
 8ct Benitoite (marquise cut)
blue
 
blue
20×10 mm 20.04×10.02 mm
actual size
Actual size of 8ct Kyanite (marquise cut, 20×10mm, Blue color)   Actual size of 8ct Benitoite (marquise cut, 20.04×10.02mm, 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 (marquise cut, 20×10mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 8ct Benitoite (marquise cut, 20.04×10.02mm) 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
 60% vs 60%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 8ct Kyanite Marquise (20×10mm, Blue) and 8ct Benitoite Marquise (20.04×10.02mm, 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 (Marquise) 8 Ct Benitoite (Marquise)
20×10 mm vs 20.04×10.02 mm
142 mm²   142.57 mm²
Face-up size outline for 8ct Benitoite (20.04×10.02mm, marquise cut)
Face-up size outline for 8ct Kyanite (20×10mm, marquise cut)
8ct Kyanite Marquise (20×10mm)
8ct Benitoite Marquise (20.04×10.02mm)
Difference: 0.4% (0.57 mm²)
8ct Benitoite (Marquise, 20.04×10.02mm) has approx. 0.4% more face-up area than 8ct Kyanite (Marquise, 20×10mm).


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