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8ct Spinel (Oval, 15.89×10.59mm, Red) vs 8ct Alexandrite (Oval, 15.69×10.46mm, Bluish Green)


Quick summary: When looked from above (face-up position), 8ct Spinel (15.89×10.59mm, oval cut) appears 3% larger than 8ct Alexandrite (15.69×10.46mm, oval cut). See below how they compare side-by-side on a ring and finger.

8ct Spinel (oval cut)
vs
 8ct Alexandrite (oval cut)
red
 
bluish green
15.89×10.59 mm 15.69×10.46 mm
actual size
Actual size of 8ct Spinel (oval cut, 15.89×10.59mm, Red color)   Actual size of 8ct Alexandrite (oval cut, 15.69×10.46mm, 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 8ct Spinel (oval cut, 15.89×10.59mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Bluish Green 8ct Alexandrite (oval cut, 15.69×10.46mm) 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
 63% vs 62%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 8ct Spinel Oval (15.89×10.59mm, Red) and 8ct Alexandrite Oval (15.69×10.46mm, 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.


8 Ct Spinel (Oval) 8 Ct Alexandrite (Oval)
15.89×10.59 mm vs 15.69×10.46 mm
137.99 mm²   134.58 mm²
Face-up size outline for 8ct Spinel (15.89×10.59mm, oval cut)
Face-up size outline for 8ct Alexandrite (15.69×10.46mm, oval cut)
8ct Spinel Oval (15.89×10.59mm)
8ct Alexandrite Oval (15.69×10.46mm)
Difference: 3% (3.41 mm²)
8ct Spinel (Oval, 15.89×10.59mm) has approx. 3% more face-up area than 8ct Alexandrite (Oval, 15.69×10.46mm).


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