×
carat vs. color  length*  width*
  ×

(or examine a )
* size in mm (optional)

30ct Benitoite (Trillion, 23.42×23.42mm, Blue) vs 30ct Alexandrite (Trillion, 23.25×23.25mm, Bluish Green)


Quick summary: When looked from above (face-up position), 30ct Benitoite (23.42×23.42mm, trillion cut) appears 1% larger than 30ct Alexandrite (23.25×23.25mm, trillion cut). See below how they compare side-by-side on a ring and finger.

30ct Benitoite (trillion cut)
vs
 30ct Alexandrite (trillion cut)
blue
 
bluish green
23.42×23.42 mm 23.25×23.25 mm
actual size
Actual size of 30ct Benitoite (trillion cut, 23.42×23.42mm, Blue color)   Actual size of 30ct Alexandrite (trillion cut, 23.25×23.25mm, 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 30ct Benitoite (trillion cut, 23.42×23.42mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Bluish Green 30ct Alexandrite (trillion cut, 23.25×23.25mm) 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
 139% vs 138%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 30ct Benitoite Trillion (23.42×23.42mm, Blue) and 30ct Alexandrite Trillion (23.25×23.25mm, 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.


30 Ct Benitoite (Trillion) 30 Ct Alexandrite (Trillion)
23.42×23.42 mm vs 23.25×23.25 mm
340.07 mm²   335.15 mm²
Face-up size outline for 30ct Benitoite (23.42×23.42mm, trillion cut)
Face-up size outline for 30ct Alexandrite (23.25×23.25mm, trillion cut)
30ct Benitoite Trillion (23.42×23.42mm)
30ct Alexandrite Trillion (23.25×23.25mm)
Difference: 1% (4.92 mm²)
30ct Benitoite (Trillion, 23.42×23.42mm) has approx. 1% more face-up area than 30ct Alexandrite (Trillion, 23.25×23.25mm).


Popular comparisons: