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8.5ct Alexandrite (Cabochon, 14.3×9.53mm, Bluish Green) vs 8.5ct Sapphire (Cabochon, 13.97×9.31mm, Blue)


Quick summary: When looked from above (face-up position), 8.5ct Alexandrite (14.3×9.53mm, cabochon cut) appears 5% larger than 8.5ct Sapphire (13.97×9.31mm, cabochon cut). See below how they compare side-by-side on a ring and finger.

8.5ct Alexandrite (cabochon cut)
vs
 8.5ct Sapphire (cabochon cut)
bluish green
 
blue
14.3×9.53 mm 13.97×9.31 mm
actual size
Actual size of 8.5ct Alexandrite (cabochon cut, 14.3×9.53mm, Bluish Green color)   Actual size of 8.5ct Sapphire (cabochon cut, 13.97×9.31mm, 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 8.5ct Alexandrite (cabochon cut, 14.3×9.53mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 8.5ct Sapphire (cabochon cut, 13.97×9.31mm) 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
 57% vs 56%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 8.5ct Alexandrite Cabochon (14.3×9.53mm, Bluish Green) and 8.5ct Sapphire Cabochon (13.97×9.31mm, 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.


8.5 Ct Alexandrite (Cabochon) 8.5 Ct Sapphire (Cabochon)
14.3×9.53 mm vs 13.97×9.31 mm
111.75 mm²   106.65 mm²
Face-up size outline for 8.5ct Alexandrite (14.3×9.53mm, cabochon cut)
Face-up size outline for 8.5ct Sapphire (13.97×9.31mm, cabochon cut)
8.5ct Alexandrite Cabochon (14.3×9.53mm)
8.5ct Sapphire Cabochon (13.97×9.31mm)
Difference: 5% (5.1 mm²)
8.5ct Alexandrite (Cabochon, 14.3×9.53mm) has approx. 5% more face-up area than 8.5ct Sapphire (Cabochon, 13.97×9.31mm).


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