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40ct Ruby (Round, 20.45×20.45mm, Red) vs 20ct Emerald (Emerald, 19.76×14.64mm, Green)


Quick summary: When looked from above (face-up position), 40ct Ruby (20.45×20.45mm, round cut) appears 22% larger than 20ct Emerald (19.76×14.64mm, emerald cut). See below how they compare side-by-side on a ring and finger.

40ct Ruby (round cut)
vs
 20ct Emerald (emerald cut)
red
 
green
20.45×20.45 mm 19.76×14.64 mm
actual size
Actual size of 40ct Ruby (round cut, 20.45×20.45mm, Red color)   Actual size of 20ct Emerald (emerald cut, 19.76×14.64mm, Green color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Red 40ct Ruby (round cut, 20.45×20.45mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Green 20ct Emerald (emerald cut, 19.76×14.64mm) 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
 122% vs 87%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 40ct Ruby Round (20.45×20.45mm, Red) and 20ct Emerald Emerald (19.76×14.64mm, 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 Emerald for a given carat weight, because it has higher specific gravity (4 vs. 2.72 - this means it's "heavier" compared to Emerald 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.


40 Ct Ruby (Round) 20 Ct Emerald (Emerald)
20.45×20.45 mm vs 19.76×14.64 mm
328.46 mm²   269.04 mm²
Face-up size outline for 40ct Ruby (20.45×20.45mm, round cut)
Face-up size outline for 20ct Emerald (19.76×14.64mm, emerald cut)
40ct Ruby Round (20.45×20.45mm)
20ct Emerald Emerald (19.76×14.64mm)
Difference: 22% (59.42 mm²)
40ct Ruby (Round, 20.45×20.45mm) has approx. 22% more face-up area than 20ct Emerald (Emerald, 19.76×14.64mm).


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