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6ct Ruby (Round, 10.86×10.86mm, Red) vs 1ct Alexandrite (Emerald, 6.55×4.85mm, Bluish Green)


Quick summary: When looked from above (face-up position), 6ct Ruby (10.86×10.86mm, round cut) appears 3.1 times larger than 1ct Alexandrite (6.55×4.85mm, emerald cut). See below how they compare side-by-side on a ring and finger.

6ct Ruby (round cut)
vs
 1ct Alexandrite (emerald cut)
red
 
bluish green
10.86×10.86 mm 6.55×4.85 mm
actual size
Actual size of 6ct Ruby (round cut, 10.86×10.86mm, Red color)   Actual size of 1ct Alexandrite (emerald cut, 6.55×4.85mm, 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 6ct Ruby (round cut, 10.86×10.86mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Bluish Green 1ct Alexandrite (emerald cut, 6.55×4.85mm) 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
 65% vs 29%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 6ct Ruby Round (10.86×10.86mm, Red) and 1ct Alexandrite Emerald (6.55×4.85mm, 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, 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.


6 Ct Ruby (Round) 1 Ct Alexandrite (Emerald)
10.86×10.86 mm vs 6.55×4.85 mm
92.63 mm²   29.54 mm²
Face-up size outline for 6ct Ruby (10.86×10.86mm, round cut)
Face-up size outline for 1ct Alexandrite (6.55×4.85mm, emerald cut)
6ct Ruby Round (10.86×10.86mm)
1ct Alexandrite Emerald (6.55×4.85mm)
Difference: 214% (63.09 mm²)
6ct Ruby (Round, 10.86×10.86mm) has approx. 214% more face-up area than 1ct Alexandrite (Emerald, 6.55×4.85mm). In other words, it's 3.14x larger.


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