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12ct Benitoite (Princess, 12.4×12.4mm, Blue) vs 12ct Alexandrite (Princess, 12.31×12.31mm, Bluish Green)


Quick summary: When looked from above (face-up position), 12ct Benitoite (12.4×12.4mm, princess cut) appears 1% larger than 12ct Alexandrite (12.31×12.31mm, princess cut). See below how they compare side-by-side on a ring and finger.

12ct Benitoite (princess cut)
vs
 12ct Alexandrite (princess cut)
blue
 
bluish green
12.4×12.4 mm 12.31×12.31 mm
actual size
Actual size of 12ct Benitoite (princess cut, 12.4×12.4mm, Blue color)   Actual size of 12ct Alexandrite (princess cut, 12.31×12.31mm, 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 12ct Benitoite (princess cut, 12.4×12.4mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Bluish Green 12ct Alexandrite (princess cut, 12.31×12.31mm) 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
 74% vs 73%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 12ct Benitoite Princess (12.4×12.4mm, Blue) and 12ct Alexandrite Princess (12.31×12.31mm, 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.


12 Ct Benitoite (Princess) 12 Ct Alexandrite (Princess)
12.4×12.4 mm vs 12.31×12.31 mm
153.76 mm²   151.54 mm²
Face-up size outline for 12ct Benitoite (12.4×12.4mm, princess cut)
Face-up size outline for 12ct Alexandrite (12.31×12.31mm, princess cut)
12ct Benitoite Princess (12.4×12.4mm)
12ct Alexandrite Princess (12.31×12.31mm)
Difference: 1% (2.22 mm²)
12ct Benitoite (Princess, 12.4×12.4mm) has approx. 1% more face-up area than 12ct Alexandrite (Princess, 12.31×12.31mm).


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