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7.5ct Spinel (Cushion, 11.22×11.22mm, Red) vs 7.5ct Alexandrite (Cushion, 11.09×11.09mm, Bluish Green)


Quick summary: When looked from above (face-up position), 7.5ct Spinel (11.22×11.22mm, cushion cut) appears 2% larger than 7.5ct Alexandrite (11.09×11.09mm, cushion cut). See below how they compare side-by-side on a ring and finger.

7.5ct Spinel (cushion cut)
vs
 7.5ct Alexandrite (cushion cut)
red
 
bluish green
11.22×11.22 mm 11.09×11.09 mm
actual size
Actual size of 7.5ct Spinel (cushion cut, 11.22×11.22mm, Red color)   Actual size of 7.5ct Alexandrite (cushion cut, 11.09×11.09mm, 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 (cushion cut, 11.22×11.22mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Bluish Green 7.5ct Alexandrite (cushion cut, 11.09×11.09mm) 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
 67% vs 66%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 7.5ct Spinel Cushion (11.22×11.22mm, Red) and 7.5ct Alexandrite Cushion (11.09×11.09mm, 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 (Cushion) 7.5 Ct Alexandrite (Cushion)
11.22×11.22 mm vs 11.09×11.09 mm
113.3 mm²   110.69 mm²
Face-up size outline for 7.5ct Spinel (11.22×11.22mm, cushion cut)
Face-up size outline for 7.5ct Alexandrite (11.09×11.09mm, cushion cut)
7.5ct Spinel Cushion (11.22×11.22mm)
7.5ct Alexandrite Cushion (11.09×11.09mm)
Difference: 2% (2.61 mm²)
7.5ct Spinel (Cushion, 11.22×11.22mm) has approx. 2% more face-up area than 7.5ct Alexandrite (Cushion, 11.09×11.09mm).


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