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30ct Diamond (Emerald, 20.76×15.38mm, White) vs 5ct Ruby (Emerald, 10.92×8.09mm, Red)


Quick summary: When looked from above (face-up position), 30ct Diamond (20.76×15.38mm, emerald cut) appears 3.6 times larger than 5ct Ruby (10.92×8.09mm, emerald cut). See below how they compare side-by-side on a ring and finger.

30ct Diamond (emerald cut)
vs
 5ct Ruby (emerald cut)
white
 
red
20.76×15.38 mm 10.92×8.09 mm
actual size
Actual size of 30ct Diamond (emerald cut, 20.76×15.38mm, White color)   Actual size of 5ct Ruby (emerald cut, 10.92×8.09mm, Red color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 30ct Diamond (emerald cut, 20.76×15.38mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Red 5ct Ruby (emerald cut, 10.92×8.09mm) 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
 92% vs 48%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 30ct Diamond Emerald (20.76×15.38mm, White) and 5ct Ruby Emerald (10.92×8.09mm, 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 Diamond for a given carat weight, because it has higher specific gravity (4 vs. 3.52 - this means it's "heavier" compared to Diamond 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.


30 Ct Diamond (Emerald) 5 Ct Ruby (Emerald)
20.76×15.38 mm vs 10.92×8.09 mm
296.94 mm²   82.16 mm²
Face-up size outline for 30ct Diamond (20.76×15.38mm, emerald cut)
Face-up size outline for 5ct Ruby (10.92×8.09mm, emerald cut)
30ct Diamond Emerald (20.76×15.38mm)
5ct Ruby Emerald (10.92×8.09mm)
Difference: 261% (214.78 mm²)
30ct Diamond (Emerald, 20.76×15.38mm) has approx. 261% more face-up area than 5ct Ruby (Emerald, 10.92×8.09mm). In other words, it's 3.61x larger.


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