×
carat vs. color  length*  width*
  ×

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

2.5ct Alexandrite (Trillion, 10.16×10.16mm, Bluish Green) vs 2.5ct Sapphire (Trillion, 9.92×9.92mm, Blue)


Quick summary: When looked from above (face-up position), 2.5ct Alexandrite (10.16×10.16mm, trillion cut) appears 5% larger than 2.5ct Sapphire (9.92×9.92mm, trillion cut). See below how they compare side-by-side on a ring and finger.

2.5ct Alexandrite (trillion cut)
vs
 2.5ct Sapphire (trillion cut)
bluish green
 
blue
10.16×10.16 mm 9.92×9.92 mm
actual size
Actual size of 2.5ct Alexandrite (trillion cut, 10.16×10.16mm, Bluish Green color)   Actual size of 2.5ct Sapphire (trillion cut, 9.92×9.92mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Bluish Green 2.5ct Alexandrite (trillion cut, 10.16×10.16mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 2.5ct Sapphire (trillion cut, 9.92×9.92mm) 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
 61% vs 59%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 2.5ct Alexandrite Trillion (10.16×10.16mm, Bluish Green) and 2.5ct Sapphire Trillion (9.92×9.92mm, 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, Sapphire will face-up smaller than Alexandrite for a given carat weight, because it has higher specific gravity (4 vs. 3.73 - this means it's "heavier" compared to Alexandrite 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.


2.5 Ct Alexandrite (Trillion) 2.5 Ct Sapphire (Trillion)
10.16×10.16 mm vs 9.92×9.92 mm
64 mm²   61.01 mm²
Face-up size outline for 2.5ct Alexandrite (10.16×10.16mm, trillion cut)
Face-up size outline for 2.5ct Sapphire (9.92×9.92mm, trillion cut)
2.5ct Alexandrite Trillion (10.16×10.16mm)
2.5ct Sapphire Trillion (9.92×9.92mm)
Difference: 5% (2.99 mm²)
2.5ct Alexandrite (Trillion, 10.16×10.16mm) has approx. 5% more face-up area than 2.5ct Sapphire (Trillion, 9.92×9.92mm).


Popular comparisons: