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6.5ct Spinel (Trillion, 14.13×14.13mm, Red) vs 6.5ct Alexandrite (Trillion, 13.96×13.96mm, Bluish Green)


Quick summary: When looked from above (face-up position), 6.5ct Spinel (14.13×14.13mm, trillion cut) appears 2% larger than 6.5ct Alexandrite (13.96×13.96mm, trillion cut). See below how they compare side-by-side on a ring and finger.

6.5ct Spinel (trillion cut)
vs
 6.5ct Alexandrite (trillion cut)
red
 
bluish green
14.13×14.13 mm 13.96×13.96 mm
actual size
Actual size of 6.5ct Spinel (trillion cut, 14.13×14.13mm, Red color)   Actual size of 6.5ct Alexandrite (trillion cut, 13.96×13.96mm, 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 6.5ct Spinel (trillion cut, 14.13×14.13mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Bluish Green 6.5ct Alexandrite (trillion cut, 13.96×13.96mm) 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
 84% vs 83%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 6.5ct Spinel Trillion (14.13×14.13mm, Red) and 6.5ct Alexandrite Trillion (13.96×13.96mm, 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.


6.5 Ct Spinel (Trillion) 6.5 Ct Alexandrite (Trillion)
14.13×14.13 mm vs 13.96×13.96 mm
123.79 mm²   120.83 mm²
Face-up size outline for 6.5ct Spinel (14.13×14.13mm, trillion cut)
Face-up size outline for 6.5ct Alexandrite (13.96×13.96mm, trillion cut)
6.5ct Spinel Trillion (14.13×14.13mm)
6.5ct Alexandrite Trillion (13.96×13.96mm)
Difference: 2% (2.96 mm²)
6.5ct Spinel (Trillion, 14.13×14.13mm) has approx. 2% more face-up area than 6.5ct Alexandrite (Trillion, 13.96×13.96mm).


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