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22ct Alexandrite (Cabochon, 19.64×13.09mm, Bluish Green) vs 22ct Topaz (Cabochon, 20×13.33mm, Blue)


Quick summary: When looked from above (face-up position), 22ct Topaz (20×13.33mm, cabochon cut) appears 4% larger than 22ct Alexandrite (19.64×13.09mm, cabochon cut). See below how they compare side-by-side on a ring and finger.

22ct Alexandrite (cabochon cut)
vs
 22ct Topaz (cabochon cut)
bluish green
 
blue
19.64×13.09 mm 20×13.33 mm
actual size
Actual size of 22ct Alexandrite (cabochon cut, 19.64×13.09mm, Bluish Green color)   Actual size of 22ct Topaz (cabochon cut, 20×13.33mm, 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 22ct Alexandrite (cabochon cut, 19.64×13.09mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 22ct Topaz (cabochon cut, 20×13.33mm) 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
 78% vs 79%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 22ct Alexandrite Cabochon (19.64×13.09mm, Bluish Green) and 22ct Topaz Cabochon (20×13.33mm, 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, Alexandrite will face-up smaller than Topaz for a given carat weight, because it has higher specific gravity (3.73 vs. 3.53 - this means it's "heavier" compared to Topaz 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.


22 Ct Alexandrite (Cabochon) 22 Ct Topaz (Cabochon)
19.64×13.09 mm vs 20×13.33 mm
210.81 mm²   218.61 mm²
Face-up size outline for 22ct Topaz (20×13.33mm, cabochon cut)
Face-up size outline for 22ct Alexandrite (19.64×13.09mm, cabochon cut)
22ct Alexandrite Cabochon (19.64×13.09mm)
22ct Topaz Cabochon (20×13.33mm)
Difference: 4% (7.8 mm²)
22ct Topaz (Cabochon, 20×13.33mm) has approx. 4% more face-up area than 22ct Alexandrite (Cabochon, 19.64×13.09mm).


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