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1ct Alexandrite (Round, 6.12×6.12mm, Bluish Green) vs 1ct Amethyst (Round, 6.86×6.86mm, Violet)


Quick summary: When looked from above (face-up position), 1ct Amethyst (6.86×6.86mm, round cut) appears 26% larger than 1ct Alexandrite (6.12×6.12mm, round cut). See below how they compare side-by-side on a ring and finger. 

1ct Alexandrite (round cut)
vs
 1ct Amethyst (round cut)
bluish green
 
violet
6.12×6.12 mm 6.86×6.86 mm
actual size
Actual size of 1ct Alexandrite (round cut, 6.12×6.12mm, Bluish Green color)   Actual size of 1ct Amethyst (round cut, 6.86×6.86mm, Violet color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Bluish Green 1ct Alexandrite (round cut, 6.12×6.12mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Violet 1ct Amethyst (round cut, 6.86×6.86mm) 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
 37% vs 41%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 1ct Alexandrite Round (6.12×6.12mm, Bluish Green) and 1ct Amethyst Round (6.86×6.86mm, Violet) 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.


1 Ct Alexandrite (Round) 1 Ct Amethyst (Round)
6.12×6.12 mm vs 6.86×6.86 mm
29.42 mm²   36.96 mm²
Face-up size outline for 1ct Amethyst (6.86×6.86mm, round cut)
Face-up size outline for 1ct Alexandrite (6.12×6.12mm, round cut)
1ct Alexandrite Round (6.12×6.12mm)
1ct Amethyst Round (6.86×6.86mm)
Difference: 26% (7.54 mm²)
1ct Amethyst (Round, 6.86×6.86mm) has approx. 26% more face-up area than 1ct Alexandrite (Round, 6.12×6.12mm).


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