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11ct Alexandrite (Trillion, 16.64×16.64mm, Bluish Green) vs 11ct Topaz (Trillion, 16.95×16.95mm, Blue)


Quick summary: When looked from above (face-up position), 11ct Topaz (16.95×16.95mm, trillion cut) appears 4% larger than 11ct Alexandrite (16.64×16.64mm, trillion cut). See below how they compare side-by-side on a ring and finger.

11ct Alexandrite (trillion cut)
vs
 11ct Topaz (trillion cut)
bluish green
 
blue
16.64×16.64 mm 16.95×16.95 mm
actual size
Actual size of 11ct Alexandrite (trillion cut, 16.64×16.64mm, Bluish Green color)   Actual size of 11ct Topaz (trillion cut, 16.95×16.95mm, 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 (trillion cut, 16.64×16.64mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 11ct Topaz (trillion cut, 16.95×16.95mm) 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
 99% vs 101%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 11ct Alexandrite Trillion (16.64×16.64mm, Bluish Green) and 11ct Topaz Trillion (16.95×16.95mm, 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 (Trillion) 11 Ct Topaz (Trillion)
16.64×16.64 mm vs 16.95×16.95 mm
171.67 mm²   178.13 mm²
Face-up size outline for 11ct Topaz (16.95×16.95mm, trillion cut)
Face-up size outline for 11ct Alexandrite (16.64×16.64mm, trillion cut)
11ct Alexandrite Trillion (16.64×16.64mm)
11ct Topaz Trillion (16.95×16.95mm)
Difference: 4% (6.46 mm²)
11ct Topaz (Trillion, 16.95×16.95mm) has approx. 4% more face-up area than 11ct Alexandrite (Trillion, 16.64×16.64mm).


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