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4ct Emerald (Emerald, 11.56×8.56mm, Dark Green) vs 40ct Ruby (Princess, 18.38×18.38mm, Red)


Quick summary: When looked from above (face-up position), 40ct Ruby (18.38×18.38mm, princess cut) appears 3.7 times larger than 4ct Emerald (11.56×8.56mm, emerald cut). See below how they compare side-by-side on a ring and finger.

4ct Emerald (emerald cut)
vs
 40ct Ruby (princess cut)
dark green
 
red
11.56×8.56 mm 18.38×18.38 mm
actual size
Actual size of 4ct Emerald (emerald cut, 11.56×8.56mm, Dark Green color)   Actual size of 40ct Ruby (princess cut, 18.38×18.38mm, Red color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Dark Green 4ct Emerald (emerald cut, 11.56×8.56mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Red 40ct Ruby (princess cut, 18.38×18.38mm) 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
 51% vs 109%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 4ct Emerald Emerald (11.56×8.56mm, Dark Green) and 40ct Ruby Princess (18.38×18.38mm, 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 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.


4 Ct Emerald (Emerald) 40 Ct Ruby (Princess)
11.56×8.56 mm vs 18.38×18.38 mm
92.03 mm²   337.82 mm²
Face-up size outline for 40ct Ruby (18.38×18.38mm, princess cut)
Face-up size outline for 4ct Emerald (11.56×8.56mm, emerald cut)
4ct Emerald Emerald (11.56×8.56mm)
40ct Ruby Princess (18.38×18.38mm)
Difference: 267% (245.79 mm²)
40ct Ruby (Princess, 18.38×18.38mm) has approx. 267% more face-up area than 4ct Emerald (Emerald, 11.56×8.56mm). In other words, it's 3.67x larger.


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