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4ct Emerald (Emerald, 11.56×8.56mm, Green) vs 0.42ct Diamond (Round, 4.87×4.87mm, White)


Quick summary: When looked from above (face-up position), 4ct Emerald (11.56×8.56mm, emerald cut) appears 4.9 times larger than 0.42ct Diamond (4.87×4.87mm, round cut). See below how they compare side-by-side on a ring and finger.

4ct Emerald (emerald cut)
vs
 0.42ct Diamond (round cut)
green
 
white
11.56×8.56 mm 4.87×4.87 mm
actual size
Actual size of 4ct Emerald (emerald cut, 11.56×8.56mm, Green color)   Actual size of 0.42ct Diamond (round cut, 4.87×4.87mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
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
White 0.42ct Diamond (round cut, 4.87×4.87mm) 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 29%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 4ct Emerald Emerald (11.56×8.56mm, Green) and 0.42ct Diamond Round (4.87×4.87mm, White) 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, Diamond will face-up smaller than Emerald for a given carat weight, because it has higher specific gravity (3.52 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) 0.42 Ct Diamond (Round)
11.56×8.56 mm vs 4.87×4.87 mm
92.03 mm²   18.63 mm²
Face-up size outline for 4ct Emerald (11.56×8.56mm, emerald cut)
Face-up size outline for 0.42ct Diamond (4.87×4.87mm, round cut)
4ct Emerald Emerald (11.56×8.56mm)
0.42ct Diamond Round (4.87×4.87mm)
Difference: 394% (73.4 mm²)
4ct Emerald (Emerald, 11.56×8.56mm) has approx. 394% more face-up area than 0.42ct Diamond (Round, 4.87×4.87mm). In other words, it's 4.94x larger.


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