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13ct Benitoite (Asscher, 12.92×12.92mm, Blue) vs 13ct Alexandrite (Asscher, 12.83×12.83mm, Bluish Green)


Quick summary: When looked from above (face-up position), 13ct Benitoite (12.92×12.92mm, asscher cut) appears 1% larger than 13ct Alexandrite (12.83×12.83mm, asscher cut). See below how they compare side-by-side on a ring and finger.

13ct Benitoite (asscher cut)
vs
 13ct Alexandrite (asscher cut)
blue
 
bluish green
12.92×12.92 mm 12.83×12.83 mm
actual size
Actual size of 13ct Benitoite (asscher cut, 12.92×12.92mm, Blue color)   Actual size of 13ct Alexandrite (asscher cut, 12.83×12.83mm, Bluish Green color)
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 13ct Benitoite (asscher cut, 12.92×12.92mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Bluish Green 13ct Alexandrite (asscher cut, 12.83×12.83mm) 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
 77% vs 76%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 13ct Benitoite Asscher (12.92×12.92mm, Blue) and 13ct Alexandrite Asscher (12.83×12.83mm, Bluish Green) 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, Alexandrite will face-up slightly smaller than Benitoite for a given carat weight, because it has higher specific gravity (3.73 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.


13 Ct Benitoite (Asscher) 13 Ct Alexandrite (Asscher)
12.92×12.92 mm vs 12.83×12.83 mm
153.57 mm²   151.44 mm²
Face-up size outline for 13ct Benitoite (12.92×12.92mm, asscher cut)
Face-up size outline for 13ct Alexandrite (12.83×12.83mm, asscher cut)
13ct Benitoite Asscher (12.92×12.92mm)
13ct Alexandrite Asscher (12.83×12.83mm)
Difference: 1% (2.13 mm²)
13ct Benitoite (Asscher, 12.92×12.92mm) has approx. 1% more face-up area than 13ct Alexandrite (Asscher, 12.83×12.83mm).


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