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10ct Alexandrite (Trillion, 16.12×16.12mm, Bluish Green) vs 10ct Sapphire (Trillion, 15.75×15.75mm, Blue)


Quick summary: When looked from above (face-up position), 10ct Alexandrite (16.12×16.12mm, trillion cut) appears 5% larger than 10ct Sapphire (15.75×15.75mm, trillion cut). See below how they compare side-by-side on a ring and finger.

10ct Alexandrite (trillion cut)
vs
 10ct Sapphire (trillion cut)
bluish green
 
blue
16.12×16.12 mm 15.75×15.75 mm
actual size
Actual size of 10ct Alexandrite (trillion cut, 16.12×16.12mm, Bluish Green color)   Actual size of 10ct Sapphire (trillion cut, 15.75×15.75mm, 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 10ct Alexandrite (trillion cut, 16.12×16.12mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 10ct Sapphire (trillion cut, 15.75×15.75mm) 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
 96% vs 94%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 10ct Alexandrite Trillion (16.12×16.12mm, Bluish Green) and 10ct Sapphire Trillion (15.75×15.75mm, 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.


10 Ct Alexandrite (Trillion) 10 Ct Sapphire (Trillion)
16.12×16.12 mm vs 15.75×15.75 mm
161.11 mm²   153.8 mm²
Face-up size outline for 10ct Alexandrite (16.12×16.12mm, trillion cut)
Face-up size outline for 10ct Sapphire (15.75×15.75mm, trillion cut)
10ct Alexandrite Trillion (16.12×16.12mm)
10ct Sapphire Trillion (15.75×15.75mm)
Difference: 5% (7.31 mm²)
10ct Alexandrite (Trillion, 16.12×16.12mm) has approx. 5% more face-up area than 10ct Sapphire (Trillion, 15.75×15.75mm).


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