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10ct Spinel (Marquise, 21.7×10.85mm, Red) vs 10ct Alexandrite (Marquise, 21.44×10.72mm, Bluish Green)


Quick summary: When looked from above (face-up position), 10ct Spinel (21.7×10.85mm, marquise cut) appears 2% larger than 10ct Alexandrite (21.44×10.72mm, marquise cut). See below how they compare side-by-side on a ring and finger.

10ct Spinel (marquise cut)
vs
 10ct Alexandrite (marquise cut)
red
 
bluish green
21.7×10.85 mm 21.44×10.72 mm
actual size
Actual size of 10ct Spinel (marquise cut, 21.7×10.85mm, Red color)   Actual size of 10ct Alexandrite (marquise cut, 21.44×10.72mm, Bluish Green color)
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Red 10ct Spinel (marquise cut, 21.7×10.85mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Bluish Green 10ct Alexandrite (marquise cut, 21.44×10.72mm) 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
 65% vs 64%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 10ct Spinel Marquise (21.7×10.85mm, Red) and 10ct Alexandrite Marquise (21.44×10.72mm, 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 Spinel for a given carat weight, because it has higher specific gravity (3.73 vs. 3.6 - this means it's "heavier" compared to Spinel 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.


10 Ct Spinel (Marquise) 10 Ct Alexandrite (Marquise)
21.7×10.85 mm vs 21.44×10.72 mm
167.17 mm²   163.18 mm²
Face-up size outline for 10ct Spinel (21.7×10.85mm, marquise cut)
Face-up size outline for 10ct Alexandrite (21.44×10.72mm, marquise cut)
10ct Spinel Marquise (21.7×10.85mm)
10ct Alexandrite Marquise (21.44×10.72mm)
Difference: 2% (3.99 mm²)
10ct Spinel (Marquise, 21.7×10.85mm) has approx. 2% more face-up area than 10ct Alexandrite (Marquise, 21.44×10.72mm).


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