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36ct Amethyst (Trillion, 27.69×27.69mm, Violet) vs 36ct Alexandrite (Trillion, 24.71×24.71mm, Bluish Green)


Quick summary: When looked from above (face-up position), 36ct Amethyst (27.69×27.69mm, trillion cut) appears 26% larger than 36ct Alexandrite (24.71×24.71mm, trillion cut). See below how they compare side-by-side on a ring and finger.

36ct Amethyst (trillion cut)
vs
 36ct Alexandrite (trillion cut)
violet
 
bluish green
27.69×27.69 mm 24.71×24.71 mm
actual size
Actual size of 36ct Amethyst (trillion cut, 27.69×27.69mm, Violet color)   Actual size of 36ct Alexandrite (trillion cut, 24.71×24.71mm, 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 (trillion cut, 27.69×27.69mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Bluish Green 36ct Alexandrite (trillion cut, 24.71×24.71mm) 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
 164% vs 147%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 36ct Amethyst Trillion (27.69×27.69mm, Violet) and 36ct Alexandrite Trillion (24.71×24.71mm, 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 (Trillion) 36 Ct Alexandrite (Trillion)
27.69×27.69 mm vs 24.71×24.71 mm
475.38 mm²   378.56 mm²
Face-up size outline for 36ct Amethyst (27.69×27.69mm, trillion cut)
Face-up size outline for 36ct Alexandrite (24.71×24.71mm, trillion cut)
36ct Amethyst Trillion (27.69×27.69mm)
36ct Alexandrite Trillion (24.71×24.71mm)
Difference: 26% (96.82 mm²)
36ct Amethyst (Trillion, 27.69×27.69mm) has approx. 26% more face-up area than 36ct Alexandrite (Trillion, 24.71×24.71mm).


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