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4.5ct Alexandrite (Trillion, 12.35×12.35mm, Bluish Green) vs 4.5ct Sapphire (Trillion, 12.07×12.07mm, Blue)


Quick summary: When looked from above (face-up position), 4.5ct Alexandrite (12.35×12.35mm, trillion cut) appears 5% larger than 4.5ct Sapphire (12.07×12.07mm, trillion cut). See below how they compare side-by-side on a ring and finger.

4.5ct Alexandrite (trillion cut)
vs
 4.5ct Sapphire (trillion cut)
bluish green
 
blue
12.35×12.35 mm 12.07×12.07 mm
actual size
Actual size of 4.5ct Alexandrite (trillion cut, 12.35×12.35mm, Bluish Green color)   Actual size of 4.5ct Sapphire (trillion cut, 12.07×12.07mm, 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 4.5ct Alexandrite (trillion cut, 12.35×12.35mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 4.5ct Sapphire (trillion cut, 12.07×12.07mm) 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
 74% vs 72%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 4.5ct Alexandrite Trillion (12.35×12.35mm, Bluish Green) and 4.5ct Sapphire Trillion (12.07×12.07mm, 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.


4.5 Ct Alexandrite (Trillion) 4.5 Ct Sapphire (Trillion)
12.35×12.35 mm vs 12.07×12.07 mm
94.56 mm²   90.32 mm²
Face-up size outline for 4.5ct Alexandrite (12.35×12.35mm, trillion cut)
Face-up size outline for 4.5ct Sapphire (12.07×12.07mm, trillion cut)
4.5ct Alexandrite Trillion (12.35×12.35mm)
4.5ct Sapphire Trillion (12.07×12.07mm)
Difference: 5% (4.24 mm²)
4.5ct Alexandrite (Trillion, 12.35×12.35mm) has approx. 5% more face-up area than 4.5ct Sapphire (Trillion, 12.07×12.07mm).


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