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19ct Amethyst (Radiant, 16.86×16.86mm, Violet) vs 19ct Alexandrite (Radiant, 15.05×15.05mm, Bluish Green)


Quick summary: When looked from above (face-up position), 19ct Amethyst (16.86×16.86mm, radiant cut) appears 25% larger than 19ct Alexandrite (15.05×15.05mm, radiant cut). See below how they compare side-by-side on a ring and finger.

19ct Amethyst (radiant cut)
vs
 19ct Alexandrite (radiant cut)
violet
 
bluish green
16.86×16.86 mm 15.05×15.05 mm
actual size
Actual size of 19ct Amethyst (radiant cut, 16.86×16.86mm, Violet color)   Actual size of 19ct Alexandrite (radiant cut, 15.05×15.05mm, 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 19ct Amethyst (radiant cut, 16.86×16.86mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Bluish Green 19ct Alexandrite (radiant cut, 15.05×15.05mm) 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
 100% vs 90%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 19ct Amethyst Radiant (16.86×16.86mm, Violet) and 19ct Alexandrite Radiant (15.05×15.05mm, 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.


19 Ct Amethyst (Radiant) 19 Ct Alexandrite (Radiant)
16.86×16.86 mm vs 15.05×15.05 mm
270.05 mm²   215.18 mm²
Face-up size outline for 19ct Amethyst (16.86×16.86mm, radiant cut)
Face-up size outline for 19ct Alexandrite (15.05×15.05mm, radiant cut)
19ct Amethyst Radiant (16.86×16.86mm)
19ct Alexandrite Radiant (15.05×15.05mm)
Difference: 25% (54.87 mm²)
19ct Amethyst (Radiant, 16.86×16.86mm) has approx. 25% more face-up area than 19ct Alexandrite (Radiant, 15.05×15.05mm).


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