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33ct Amethyst (Radiant, 20.27×20.27mm, Violet) vs 33ct Alexandrite (Radiant, 18.09×18.09mm, Bluish Green)


Quick summary: When looked from above (face-up position), 33ct Amethyst (20.27×20.27mm, radiant cut) appears 26% larger than 33ct Alexandrite (18.09×18.09mm, radiant cut). See below how they compare side-by-side on a ring and finger.

33ct Amethyst (radiant cut)
vs
 33ct Alexandrite (radiant cut)
violet
 
bluish green
20.27×20.27 mm 18.09×18.09 mm
actual size
Actual size of 33ct Amethyst (radiant cut, 20.27×20.27mm, Violet color)   Actual size of 33ct Alexandrite (radiant cut, 18.09×18.09mm, 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 33ct Amethyst (radiant cut, 20.27×20.27mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Bluish Green 33ct Alexandrite (radiant cut, 18.09×18.09mm) 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
 120% vs 108%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 33ct Amethyst Radiant (20.27×20.27mm, Violet) and 33ct Alexandrite Radiant (18.09×18.09mm, 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.


33 Ct Amethyst (Radiant) 33 Ct Alexandrite (Radiant)
20.27×20.27 mm vs 18.09×18.09 mm
390.33 mm²   310.89 mm²
Face-up size outline for 33ct Amethyst (20.27×20.27mm, radiant cut)
Face-up size outline for 33ct Alexandrite (18.09×18.09mm, radiant cut)
33ct Amethyst Radiant (20.27×20.27mm)
33ct Alexandrite Radiant (18.09×18.09mm)
Difference: 26% (79.44 mm²)
33ct Amethyst (Radiant, 20.27×20.27mm) has approx. 26% more face-up area than 33ct Alexandrite (Radiant, 18.09×18.09mm).


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