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7.5ct Spinel (Oval, 15.54×10.36mm, Red) vs 7.5ct Alexandrite (Oval, 15.36×10.24mm, Bluish Green)


Quick summary: When looked from above (face-up position), 7.5ct Spinel (15.54×10.36mm, oval cut) appears 2% larger than 7.5ct Alexandrite (15.36×10.24mm, oval cut). See below how they compare side-by-side on a ring and finger.

7.5ct Spinel (oval cut)
vs
 7.5ct Alexandrite (oval cut)
red
 
bluish green
15.54×10.36 mm 15.36×10.24 mm
actual size
Actual size of 7.5ct Spinel (oval cut, 15.54×10.36mm, Red color)   Actual size of 7.5ct Alexandrite (oval cut, 15.36×10.24mm, 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 7.5ct Spinel (oval cut, 15.54×10.36mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Bluish Green 7.5ct Alexandrite (oval cut, 15.36×10.24mm) 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
 62% vs 61%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 7.5ct Spinel Oval (15.54×10.36mm, Red) and 7.5ct Alexandrite Oval (15.36×10.24mm, 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.


7.5 Ct Spinel (Oval) 7.5 Ct Alexandrite (Oval)
15.54×10.36 mm vs 15.36×10.24 mm
132.02 mm²   128.97 mm²
Face-up size outline for 7.5ct Spinel (15.54×10.36mm, oval cut)
Face-up size outline for 7.5ct Alexandrite (15.36×10.24mm, oval cut)
7.5ct Spinel Oval (15.54×10.36mm)
7.5ct Alexandrite Oval (15.36×10.24mm)
Difference: 2% (3.05 mm²)
7.5ct Spinel (Oval, 15.54×10.36mm) has approx. 2% more face-up area than 7.5ct Alexandrite (Oval, 15.36×10.24mm).


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