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26ct Diaspore (Round, 18.7×18.7mm, Light Yellowish Green) vs 26ct Alexandrite (Round, 18.13×18.13mm, Bluish Green)


Quick summary: When looked from above (face-up position), 26ct Diaspore (18.7×18.7mm, round cut) appears 6% larger than 26ct Alexandrite (18.13×18.13mm, round cut). See below how they compare side-by-side on a ring and finger.

26ct Diaspore (round cut)
vs
 26ct Alexandrite (round cut)
light yellowish green
 
bluish green
18.7×18.7 mm 18.13×18.13 mm
actual size
Actual size of 26ct Diaspore (round cut, 18.7×18.7mm, Light Yellowish Green color)   Actual size of 26ct Alexandrite (round cut, 18.13×18.13mm, 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 26ct Diaspore (round cut, 18.7×18.7mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Bluish Green 26ct Alexandrite (round cut, 18.13×18.13mm) 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
 111% vs 108%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 26ct Diaspore Round (18.7×18.7mm, Light Yellowish Green) and 26ct Alexandrite Round (18.13×18.13mm, 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.


26 Ct Diaspore (Round) 26 Ct Alexandrite (Round)
18.7×18.7 mm vs 18.13×18.13 mm
274.65 mm²   258.16 mm²
Face-up size outline for 26ct Diaspore (18.7×18.7mm, round cut)
Face-up size outline for 26ct Alexandrite (18.13×18.13mm, round cut)
26ct Diaspore Round (18.7×18.7mm)
26ct Alexandrite Round (18.13×18.13mm)
Difference: 6% (16.49 mm²)
26ct Diaspore (Round, 18.7×18.7mm) has approx. 6% more face-up area than 26ct Alexandrite (Round, 18.13×18.13mm).


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