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12ct Amethyst (Princess, 13.79×13.79mm, Violet) vs 12ct Alexandrite (Princess, 12.31×12.31mm, Bluish Green)


Quick summary: When looked from above (face-up position), 12ct Amethyst (13.79×13.79mm, princess cut) appears 25% larger than 12ct Alexandrite (12.31×12.31mm, princess cut). See below how they compare side-by-side on a ring and finger.

12ct Amethyst (princess cut)
vs
 12ct Alexandrite (princess cut)
violet
 
bluish green
13.79×13.79 mm 12.31×12.31 mm
actual size
Actual size of 12ct Amethyst (princess cut, 13.79×13.79mm, Violet color)   Actual size of 12ct Alexandrite (princess cut, 12.31×12.31mm, Bluish Green color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Violet 12ct Amethyst (princess cut, 13.79×13.79mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Bluish Green 12ct Alexandrite (princess cut, 12.31×12.31mm) 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
 82% vs 73%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 12ct Amethyst Princess (13.79×13.79mm, Violet) and 12ct Alexandrite Princess (12.31×12.31mm, Bluish Green) 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 Amethyst for a given carat weight, because it has higher specific gravity (3.73 vs. 2.65 - this means it's "heavier" compared to Amethyst 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.


12 Ct Amethyst (Princess) 12 Ct Alexandrite (Princess)
13.79×13.79 mm vs 12.31×12.31 mm
190.16 mm²   151.54 mm²
Face-up size outline for 12ct Amethyst (13.79×13.79mm, princess cut)
Face-up size outline for 12ct Alexandrite (12.31×12.31mm, princess cut)
12ct Amethyst Princess (13.79×13.79mm)
12ct Alexandrite Princess (12.31×12.31mm)
Difference: 25% (38.62 mm²)
12ct Amethyst (Princess, 13.79×13.79mm) has approx. 25% more face-up area than 12ct Alexandrite (Princess, 12.31×12.31mm).


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