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28ct Diaspore (Emerald, 20.47×15.16mm, Light Yellowish Green) vs 28ct Alexandrite (Emerald, 19.85×14.7mm, Bluish Green)


Quick summary: When looked from above (face-up position), 28ct Diaspore (20.47×15.16mm, emerald cut) appears 6% larger than 28ct Alexandrite (19.85×14.7mm, emerald cut). See below how they compare side-by-side on a ring and finger.

28ct Diaspore (emerald cut)
vs
 28ct Alexandrite (emerald cut)
light yellowish green
 
bluish green
20.47×15.16 mm 19.85×14.7 mm
actual size
Actual size of 28ct Diaspore (emerald cut, 20.47×15.16mm, Light Yellowish Green color)   Actual size of 28ct Alexandrite (emerald cut, 19.85×14.7mm, Bluish Green color)
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Light Yellowish Green 28ct Diaspore (emerald cut, 20.47×15.16mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Bluish Green 28ct Alexandrite (emerald cut, 19.85×14.7mm) 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
 90% vs 87%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 28ct Diaspore Emerald (20.47×15.16mm, Light Yellowish Green) and 28ct Alexandrite Emerald (19.85×14.7mm, 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 Diaspore for a given carat weight, because it has higher specific gravity (3.73 vs. 3.4 - this means it's "heavier" compared to Diaspore 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 Diaspore (Emerald) 28 Ct Alexandrite (Emerald)
20.47×15.16 mm vs 19.85×14.7 mm
288.6 mm²   271.37 mm²
Face-up size outline for 28ct Diaspore (20.47×15.16mm, emerald cut)
Face-up size outline for 28ct Alexandrite (19.85×14.7mm, emerald cut)
28ct Diaspore Emerald (20.47×15.16mm)
28ct Alexandrite Emerald (19.85×14.7mm)
Difference: 6% (17.23 mm²)
28ct Diaspore (Emerald, 20.47×15.16mm) has approx. 6% more face-up area than 28ct Alexandrite (Emerald, 19.85×14.7mm).


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