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11ct Alexandrite (Radiant, 12.54×12.54mm, Bluish Green) vs 11ct Topaz (Radiant, 12.77×12.77mm, Blue)


Quick summary: When looked from above (face-up position), 11ct Topaz (12.77×12.77mm, radiant cut) appears 4% larger than 11ct Alexandrite (12.54×12.54mm, radiant cut). See below how they compare side-by-side on a ring and finger.

11ct Alexandrite (radiant cut)
vs
 11ct Topaz (radiant cut)
bluish green
 
blue
12.54×12.54 mm 12.77×12.77 mm
actual size
Actual size of 11ct Alexandrite (radiant cut, 12.54×12.54mm, Bluish Green color)   Actual size of 11ct Topaz (radiant cut, 12.77×12.77mm, 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 11ct Alexandrite (radiant cut, 12.54×12.54mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 11ct Topaz (radiant cut, 12.77×12.77mm) 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
 75% vs 76%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 11ct Alexandrite Radiant (12.54×12.54mm, Bluish Green) and 11ct Topaz Radiant (12.77×12.77mm, 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.


11 Ct Alexandrite (Radiant) 11 Ct Topaz (Radiant)
12.54×12.54 mm vs 12.77×12.77 mm
149.39 mm²   154.92 mm²
Face-up size outline for 11ct Topaz (12.77×12.77mm, radiant cut)
Face-up size outline for 11ct Alexandrite (12.54×12.54mm, radiant cut)
11ct Alexandrite Radiant (12.54×12.54mm)
11ct Topaz Radiant (12.77×12.77mm)
Difference: 4% (5.53 mm²)
11ct Topaz (Radiant, 12.77×12.77mm) has approx. 4% more face-up area than 11ct Alexandrite (Radiant, 12.54×12.54mm).


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