×
carat vs. color  length*  width*
  ×

(or examine a )
* size in mm (optional)

16ct Amethyst (Emerald, 18.45×13.67mm, Violet) vs 16ct Alexandrite (Emerald, 16.47×12.2mm, Bluish Green)


Quick summary: When looked from above (face-up position), 16ct Amethyst (18.45×13.67mm, emerald cut) appears 26% larger than 16ct Alexandrite (16.47×12.2mm, emerald cut). See below how they compare side-by-side on a ring and finger.

16ct Amethyst (emerald cut)
vs
 16ct Alexandrite (emerald cut)
violet
 
bluish green
18.45×13.67 mm 16.47×12.2 mm
actual size
Actual size of 16ct Amethyst (emerald cut, 18.45×13.67mm, Violet color)   Actual size of 16ct Alexandrite (emerald cut, 16.47×12.2mm, 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 16ct Amethyst (emerald cut, 18.45×13.67mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Bluish Green 16ct Alexandrite (emerald cut, 16.47×12.2mm) 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
 81% vs 73%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 16ct Amethyst Emerald (18.45×13.67mm, Violet) and 16ct Alexandrite Emerald (16.47×12.2mm, 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.


16 Ct Amethyst (Emerald) 16 Ct Alexandrite (Emerald)
18.45×13.67 mm vs 16.47×12.2 mm
234.56 mm²   186.87 mm²
Face-up size outline for 16ct Amethyst (18.45×13.67mm, emerald cut)
Face-up size outline for 16ct Alexandrite (16.47×12.2mm, emerald cut)
16ct Amethyst Emerald (18.45×13.67mm)
16ct Alexandrite Emerald (16.47×12.2mm)
Difference: 26% (47.69 mm²)
16ct Amethyst (Emerald, 18.45×13.67mm) has approx. 26% more face-up area than 16ct Alexandrite (Emerald, 16.47×12.2mm).


Popular comparisons: