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20ct Diaspore (Trillion, 20.95×20.95mm, Light Yellowish Green) vs 20ct Alexandrite (Trillion, 20.31×20.31mm, Bluish Green)


Quick summary: When looked from above (face-up position), 20ct Diaspore (20.95×20.95mm, trillion cut) appears 6% larger than 20ct Alexandrite (20.31×20.31mm, trillion cut). See below how they compare side-by-side on a ring and finger.

20ct Diaspore (trillion cut)
vs
 20ct Alexandrite (trillion cut)
light yellowish green
 
bluish green
20.95×20.95 mm 20.31×20.31 mm
actual size
Actual size of 20ct Diaspore (trillion cut, 20.95×20.95mm, Light Yellowish Green color)   Actual size of 20ct Alexandrite (trillion cut, 20.31×20.31mm, 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 20ct Diaspore (trillion cut, 20.95×20.95mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Bluish Green 20ct Alexandrite (trillion cut, 20.31×20.31mm) 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
 124% vs 121%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 20ct Diaspore Trillion (20.95×20.95mm, Light Yellowish Green) and 20ct Alexandrite Trillion (20.31×20.31mm, 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.


20 Ct Diaspore (Trillion) 20 Ct Alexandrite (Trillion)
20.95×20.95 mm vs 20.31×20.31 mm
272.12 mm²   255.75 mm²
Face-up size outline for 20ct Diaspore (20.95×20.95mm, trillion cut)
Face-up size outline for 20ct Alexandrite (20.31×20.31mm, trillion cut)
20ct Diaspore Trillion (20.95×20.95mm)
20ct Alexandrite Trillion (20.31×20.31mm)
Difference: 6% (16.37 mm²)
20ct Diaspore (Trillion, 20.95×20.95mm) has approx. 6% more face-up area than 20ct Alexandrite (Trillion, 20.31×20.31mm).


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