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40ct Diaspore (Radiant, 19.89×19.89mm, Light Yellowish Green) vs 40ct Alexandrite (Radiant, 19.29×19.29mm, Bluish Green)


Quick summary: When looked from above (face-up position), 40ct Diaspore (19.89×19.89mm, radiant cut) appears 6% larger than 40ct Alexandrite (19.29×19.29mm, radiant cut). See below how they compare side-by-side on a ring and finger.

40ct Diaspore (radiant cut)
vs
 40ct Alexandrite (radiant cut)
light yellowish green
 
bluish green
19.89×19.89 mm 19.29×19.29 mm
actual size
Actual size of 40ct Diaspore (radiant cut, 19.89×19.89mm, Light Yellowish Green color)   Actual size of 40ct Alexandrite (radiant cut, 19.29×19.29mm, 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 40ct Diaspore (radiant cut, 19.89×19.89mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Bluish Green 40ct Alexandrite (radiant cut, 19.29×19.29mm) 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
 118% vs 115%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 40ct Diaspore Radiant (19.89×19.89mm, Light Yellowish Green) and 40ct Alexandrite Radiant (19.29×19.29mm, 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.


40 Ct Diaspore (Radiant) 40 Ct Alexandrite (Radiant)
19.89×19.89 mm vs 19.29×19.29 mm
375.83 mm²   353.5 mm²
Face-up size outline for 40ct Diaspore (19.89×19.89mm, radiant cut)
Face-up size outline for 40ct Alexandrite (19.29×19.29mm, radiant cut)
40ct Diaspore Radiant (19.89×19.89mm)
40ct Alexandrite Radiant (19.29×19.29mm)
Difference: 6% (22.33 mm²)
40ct Diaspore (Radiant, 19.89×19.89mm) has approx. 6% more face-up area than 40ct Alexandrite (Radiant, 19.29×19.29mm).


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