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36ct Amethyst (Cushion, 20.97×20.97mm, Violet) vs 36ct Alexandrite (Cushion, 18.71×18.71mm, Bluish Green)


Quick summary: When looked from above (face-up position), 36ct Amethyst (20.97×20.97mm, cushion cut) appears 26% larger than 36ct Alexandrite (18.71×18.71mm, cushion cut). See below how they compare side-by-side on a ring and finger.

36ct Amethyst (cushion cut)
vs
 36ct Alexandrite (cushion cut)
violet
 
bluish green
20.97×20.97 mm 18.71×18.71 mm
actual size
Actual size of 36ct Amethyst (cushion cut, 20.97×20.97mm, Violet color)   Actual size of 36ct Alexandrite (cushion cut, 18.71×18.71mm, 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 36ct Amethyst (cushion cut, 20.97×20.97mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Bluish Green 36ct Alexandrite (cushion cut, 18.71×18.71mm) 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
 125% vs 111%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 36ct Amethyst Cushion (20.97×20.97mm, Violet) and 36ct Alexandrite Cushion (18.71×18.71mm, 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.


36 Ct Amethyst (Cushion) 36 Ct Alexandrite (Cushion)
20.97×20.97 mm vs 18.71×18.71 mm
395.77 mm²   315.06 mm²
Face-up size outline for 36ct Amethyst (20.97×20.97mm, cushion cut)
Face-up size outline for 36ct Alexandrite (18.71×18.71mm, cushion cut)
36ct Amethyst Cushion (20.97×20.97mm)
36ct Alexandrite Cushion (18.71×18.71mm)
Difference: 26% (80.71 mm²)
36ct Amethyst (Cushion, 20.97×20.97mm) has approx. 26% more face-up area than 36ct Alexandrite (Cushion, 18.71×18.71mm).


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