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28ct Amethyst (Oval, 26.7×17.8mm, Violet) vs 28ct Alexandrite (Oval, 23.84×15.89mm, Bluish Green)


Quick summary: When looked from above (face-up position), 28ct Amethyst (26.7×17.8mm, oval cut) appears 25% larger than 28ct Alexandrite (23.84×15.89mm, oval cut). See below how they compare side-by-side on a ring and finger.

28ct Amethyst (oval cut)
vs
 28ct Alexandrite (oval cut)
violet
 
bluish green
26.7×17.8 mm 23.84×15.89 mm
actual size
Actual size of 28ct Amethyst (oval cut, 26.7×17.8mm, Violet color)   Actual size of 28ct Alexandrite (oval cut, 23.84×15.89mm, 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 28ct Amethyst (oval cut, 26.7×17.8mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Bluish Green 28ct Alexandrite (oval cut, 23.84×15.89mm) 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
 106% vs 95%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 28ct Amethyst Oval (26.7×17.8mm, Violet) and 28ct Alexandrite Oval (23.84×15.89mm, 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.


28 Ct Amethyst (Oval) 28 Ct Alexandrite (Oval)
26.7×17.8 mm vs 23.84×15.89 mm
389.71 mm²   310.63 mm²
Face-up size outline for 28ct Amethyst (26.7×17.8mm, oval cut)
Face-up size outline for 28ct Alexandrite (23.84×15.89mm, oval cut)
28ct Amethyst Oval (26.7×17.8mm)
28ct Alexandrite Oval (23.84×15.89mm)
Difference: 25% (79.08 mm²)
28ct Amethyst (Oval, 26.7×17.8mm) has approx. 25% more face-up area than 28ct Alexandrite (Oval, 23.84×15.89mm).


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