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0.3ct Ruby (Pear, 5.56×3.35mm, Red) vs 0.3ct Alexandrite (Marquise, 6.78×3.39mm, Red)


Quick summary: When looked from above (face-up position), 0.3ct Alexandrite (6.78×3.39mm, marquise cut) appears 20% larger than 0.3ct Ruby (5.56×3.35mm, pear cut). See below how they compare side-by-side on a ring and finger.

0.3ct Ruby (pear cut)
vs
 0.3ct Alexandrite (marquise cut)
red
 
red
5.56×3.35 mm 6.78×3.39 mm
actual size
Actual size of 0.3ct Ruby (pear cut, 5.56×3.35mm, Red color)   Actual size of 0.3ct Alexandrite (marquise cut, 6.78×3.39mm, Red color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Red 0.3ct Ruby (pear cut, 5.56×3.35mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Red 0.3ct Alexandrite (marquise cut, 6.78×3.39mm) 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
 20% vs 21%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 0.3ct Ruby Pear (5.56×3.35mm, Red) and 0.3ct Alexandrite Marquise (6.78×3.39mm, Red) 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, Ruby will face-up smaller than Alexandrite for a given carat weight, because it has higher specific gravity (4 vs. 3.73 - this means it's "heavier" compared to Alexandrite 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.


0.3 Ct Ruby (Pear) 0.3 Ct Alexandrite (Marquise)
5.56×3.35 mm vs 6.78×3.39 mm
13.6 mm²   16.32 mm²
Face-up size outline for 0.3ct Alexandrite (6.78×3.39mm, marquise cut)
Face-up size outline for 0.3ct Ruby (5.56×3.35mm, pear cut)
0.3ct Ruby Pear (5.56×3.35mm)
0.3ct Alexandrite Marquise (6.78×3.39mm)
Difference: 20% (2.72 mm²)
0.3ct Alexandrite (Marquise, 6.78×3.39mm) has approx. 20% more face-up area than 0.3ct Ruby (Pear, 5.56×3.35mm).


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