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19ct Benitoite (Cabochon, 18.83×12.55mm, Blue) vs 19ct Alexandrite (Cabochon, 18.69×12.46mm, Bluish Green)


Quick summary: When looked from above (face-up position), 19ct Benitoite (18.83×12.55mm, cabochon cut) appears 1% larger than 19ct Alexandrite (18.69×12.46mm, cabochon cut). See below how they compare side-by-side on a ring and finger.

19ct Benitoite (cabochon cut)
vs
 19ct Alexandrite (cabochon cut)
blue
 
bluish green
18.83×12.55 mm 18.69×12.46 mm
actual size
Actual size of 19ct Benitoite (cabochon cut, 18.83×12.55mm, Blue color)   Actual size of 19ct Alexandrite (cabochon cut, 18.69×12.46mm, 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 19ct Benitoite (cabochon cut, 18.83×12.55mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Bluish Green 19ct Alexandrite (cabochon cut, 18.69×12.46mm) 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
 75% vs 74%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 19ct Benitoite Cabochon (18.83×12.55mm, Blue) and 19ct Alexandrite Cabochon (18.69×12.46mm, 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.


19 Ct Benitoite (Cabochon) 19 Ct Alexandrite (Cabochon)
18.83×12.55 mm vs 18.69×12.46 mm
193.78 mm²   190.96 mm²
Face-up size outline for 19ct Benitoite (18.83×12.55mm, cabochon cut)
Face-up size outline for 19ct Alexandrite (18.69×12.46mm, cabochon cut)
19ct Benitoite Cabochon (18.83×12.55mm)
19ct Alexandrite Cabochon (18.69×12.46mm)
Difference: 1% (2.82 mm²)
19ct Benitoite (Cabochon, 18.83×12.55mm) has approx. 1% more face-up area than 19ct Alexandrite (Cabochon, 18.69×12.46mm).


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