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4.5ct Alexandrite (Cabochon, 11.57×7.71mm, Bluish Green) vs 4.5ct Sapphire (Cabochon, 11.3×7.53mm, Blue)


Quick summary: When looked from above (face-up position), 4.5ct Alexandrite (11.57×7.71mm, cabochon cut) appears 5% larger than 4.5ct Sapphire (11.3×7.53mm, cabochon cut). See below how they compare side-by-side on a ring and finger.

4.5ct Alexandrite (cabochon cut)
vs
 4.5ct Sapphire (cabochon cut)
bluish green
 
blue
11.57×7.71 mm 11.3×7.53 mm
actual size
Actual size of 4.5ct Alexandrite (cabochon cut, 11.57×7.71mm, Bluish Green color)   Actual size of 4.5ct Sapphire (cabochon cut, 11.3×7.53mm, 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 4.5ct Alexandrite (cabochon cut, 11.57×7.71mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 4.5ct Sapphire (cabochon cut, 11.3×7.53mm) 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
 46% vs 45%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 4.5ct Alexandrite Cabochon (11.57×7.71mm, Bluish Green) and 4.5ct Sapphire Cabochon (11.3×7.53mm, 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.


4.5 Ct Alexandrite (Cabochon) 4.5 Ct Sapphire (Cabochon)
11.57×7.71 mm vs 11.3×7.53 mm
73.15 mm²   69.77 mm²
Face-up size outline for 4.5ct Alexandrite (11.57×7.71mm, cabochon cut)
Face-up size outline for 4.5ct Sapphire (11.3×7.53mm, cabochon cut)
4.5ct Alexandrite Cabochon (11.57×7.71mm)
4.5ct Sapphire Cabochon (11.3×7.53mm)
Difference: 5% (3.38 mm²)
4.5ct Alexandrite (Cabochon, 11.57×7.71mm) has approx. 5% more face-up area than 4.5ct Sapphire (Cabochon, 11.3×7.53mm).


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