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12ct Diaspore (Emerald, 15.43×11.43mm, Light Yellowish Green) vs 12ct Alexandrite (Emerald, 14.96×11.08mm, Bluish Green)


Quick summary: When looked from above (face-up position), 12ct Diaspore (15.43×11.43mm, emerald cut) appears 6% larger than 12ct Alexandrite (14.96×11.08mm, emerald cut). See below how they compare side-by-side on a ring and finger.

12ct Diaspore (emerald cut)
vs
 12ct Alexandrite (emerald cut)
light yellowish green
 
bluish green
15.43×11.43 mm 14.96×11.08 mm
actual size
Actual size of 12ct Diaspore (emerald cut, 15.43×11.43mm, Light Yellowish Green color)   Actual size of 12ct Alexandrite (emerald cut, 14.96×11.08mm, 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 12ct Diaspore (emerald cut, 15.43×11.43mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Bluish Green 12ct Alexandrite (emerald cut, 14.96×11.08mm) 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
 68% vs 66%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 12ct Diaspore Emerald (15.43×11.43mm, Light Yellowish Green) and 12ct Alexandrite Emerald (14.96×11.08mm, 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.


12 Ct Diaspore (Emerald) 12 Ct Alexandrite (Emerald)
15.43×11.43 mm vs 14.96×11.08 mm
164.02 mm²   154.15 mm²
Face-up size outline for 12ct Diaspore (15.43×11.43mm, emerald cut)
Face-up size outline for 12ct Alexandrite (14.96×11.08mm, emerald cut)
12ct Diaspore Emerald (15.43×11.43mm)
12ct Alexandrite Emerald (14.96×11.08mm)
Difference: 6% (9.87 mm²)
12ct Diaspore (Emerald, 15.43×11.43mm) has approx. 6% more face-up area than 12ct Alexandrite (Emerald, 14.96×11.08mm).


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