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15ct Diaspore (Marquise, 25.32×12.66mm, Light Yellowish Green) vs 15ct Alexandrite (Marquise, 24.54×12.27mm, Bluish Green)


Quick summary: When looked from above (face-up position), 15ct Diaspore (25.32×12.66mm, marquise cut) appears 6% larger than 15ct Alexandrite (24.54×12.27mm, marquise cut). See below how they compare side-by-side on a ring and finger.

15ct Diaspore (marquise cut)
vs
 15ct Alexandrite (marquise cut)
light yellowish green
 
bluish green
25.32×12.66 mm 24.54×12.27 mm
actual size
Actual size of 15ct Diaspore (marquise cut, 25.32×12.66mm, Light Yellowish Green color)   Actual size of 15ct Alexandrite (marquise cut, 24.54×12.27mm, 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 15ct Diaspore (marquise cut, 25.32×12.66mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Bluish Green 15ct Alexandrite (marquise cut, 24.54×12.27mm) 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
 75% vs 73%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 15ct Diaspore Marquise (25.32×12.66mm, Light Yellowish Green) and 15ct Alexandrite Marquise (24.54×12.27mm, 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.


15 Ct Diaspore (Marquise) 15 Ct Alexandrite (Marquise)
25.32×12.66 mm vs 24.54×12.27 mm
227.59 mm²   213.79 mm²
Face-up size outline for 15ct Diaspore (25.32×12.66mm, marquise cut)
Face-up size outline for 15ct Alexandrite (24.54×12.27mm, marquise cut)
15ct Diaspore Marquise (25.32×12.66mm)
15ct Alexandrite Marquise (24.54×12.27mm)
Difference: 6% (13.8 mm²)
15ct Diaspore (Marquise, 25.32×12.66mm) has approx. 6% more face-up area than 15ct Alexandrite (Marquise, 24.54×12.27mm).


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