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20ct Ruby (Round, 16.23×16.23mm, Red) vs 11.08ct Amethyst (Emerald, 16.34×12.1mm, Violet)


Quick summary: When looked from above (face-up position), 20ct Ruby (16.23×16.23mm, round cut) appears 13% larger than 11.08ct Amethyst (16.34×12.1mm, emerald cut). See below how they compare side-by-side on a ring and finger.

20ct Ruby (round cut)
vs
 11.08ct Amethyst (emerald cut)
red
 
violet
16.23×16.23 mm 16.34×12.1 mm
actual size
Actual size of 20ct Ruby (round cut, 16.23×16.23mm, Red color)   Actual size of 11.08ct Amethyst (emerald cut, 16.34×12.1mm, Violet color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Red 20ct Ruby (round cut, 16.23×16.23mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Violet 11.08ct Amethyst (emerald cut, 16.34×12.1mm) 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
 97% vs 72%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 20ct Ruby Round (16.23×16.23mm, Red) and 11.08ct Amethyst Emerald (16.34×12.1mm, Violet) 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 Amethyst for a given carat weight, because it has higher specific gravity (4 vs. 2.65 - this means it's "heavier" compared to Amethyst 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.


20 Ct Ruby (Round) 11.08 Ct Amethyst (Emerald)
16.23×16.23 mm vs 16.34×12.1 mm
206.88 mm²   183.87 mm²
Face-up size outline for 20ct Ruby (16.23×16.23mm, round cut)
Face-up size outline for 11.08ct Amethyst (16.34×12.1mm, emerald cut)
20ct Ruby Round (16.23×16.23mm)
11.08ct Amethyst Emerald (16.34×12.1mm)
Difference: 13% (23.01 mm²)
20ct Ruby (Round, 16.23×16.23mm) has approx. 13% more face-up area than 11.08ct Amethyst (Emerald, 16.34×12.1mm).


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