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1ct Alexandrite (Marquise, 10×5mm, Bluish Green) vs 1ct Aquamarine (Cushion, 6.37×6.37mm, Light Blue)


Quick summary: When looked from above (face-up position), 1ct Aquamarine (6.37×6.37mm, cushion cut) appears 3% larger than 1ct Alexandrite (10×5mm, marquise cut). See below how they compare side-by-side on a ring and finger.

1ct Alexandrite (marquise cut)
vs
 1ct Aquamarine (cushion cut)
bluish green
 
light blue
10×5 mm 6.37×6.37 mm
actual size
Actual size of 1ct Alexandrite (marquise cut, 10×5mm, Bluish Green color)   Actual size of 1ct Aquamarine (cushion cut, 6.37×6.37mm, Light Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Bluish Green 1ct Alexandrite (marquise cut, 10×5mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Light Blue 1ct Aquamarine (cushion cut, 6.37×6.37mm) 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
 30% vs 38%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 1ct Alexandrite Marquise (10×5mm, Bluish Green) and 1ct Aquamarine Cushion (6.37×6.37mm, Light Blue) 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 Aquamarine for a given carat weight, because it has higher specific gravity (3.73 vs. 2.72 - this means it's "heavier" compared to Aquamarine 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.


1 Ct Alexandrite (Marquise) 1 Ct Aquamarine (Cushion)
10×5 mm vs 6.37×6.37 mm
35.5 mm²   36.52 mm²
Face-up size outline for 1ct Aquamarine (6.37×6.37mm, cushion cut)
Face-up size outline for 1ct Alexandrite (10×5mm, marquise cut)
1ct Alexandrite Marquise (10×5mm)
1ct Aquamarine Cushion (6.37×6.37mm)
Difference: 3% (1.02 mm²)
1ct Aquamarine (Cushion, 6.37×6.37mm) has approx. 3% more face-up area than 1ct Alexandrite (Marquise, 10×5mm).


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