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22ct Alexandrite (Emerald, 18.32×13.57mm, Bluish Green) vs 22ct Topaz (Emerald, 18.66×13.82mm, Blue)


Quick summary: When looked from above (face-up position), 22ct Topaz (18.66×13.82mm, emerald cut) appears 4% larger than 22ct Alexandrite (18.32×13.57mm, emerald cut). See below how they compare side-by-side on a ring and finger.

22ct Alexandrite (emerald cut)
vs
 22ct Topaz (emerald cut)
bluish green
 
blue
18.32×13.57 mm 18.66×13.82 mm
actual size
Actual size of 22ct Alexandrite (emerald cut, 18.32×13.57mm, Bluish Green color)   Actual size of 22ct Topaz (emerald cut, 18.66×13.82mm, 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 (emerald cut, 18.32×13.57mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 22ct Topaz (emerald cut, 18.66×13.82mm) 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
 81% vs 82%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 22ct Alexandrite Emerald (18.32×13.57mm, Bluish Green) and 22ct Topaz Emerald (18.66×13.82mm, 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 (Emerald) 22 Ct Topaz (Emerald)
18.32×13.57 mm vs 18.66×13.82 mm
231.2 mm²   239.83 mm²
Face-up size outline for 22ct Topaz (18.66×13.82mm, emerald cut)
Face-up size outline for 22ct Alexandrite (18.32×13.57mm, emerald cut)
22ct Alexandrite Emerald (18.32×13.57mm)
22ct Topaz Emerald (18.66×13.82mm)
Difference: 4% (8.63 mm²)
22ct Topaz (Emerald, 18.66×13.82mm) has approx. 4% more face-up area than 22ct Alexandrite (Emerald, 18.32×13.57mm).


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