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40ct Ruby (Emerald, 21.84×16.18mm, Red) vs 0.9ct Diamond (Emerald, 6.45×4.78mm, White)


Quick summary: When looked from above (face-up position), 40ct Ruby (21.84×16.18mm, emerald cut) appears 11.5 times larger than 0.9ct Diamond (6.45×4.78mm, emerald cut). See below how they compare side-by-side on a ring and finger.

40ct Ruby (emerald cut)
vs
 0.9ct Diamond (emerald cut)
red
 
white
21.84×16.18 mm 6.45×4.78 mm
actual size
Actual size of 40ct Ruby (emerald cut, 21.84×16.18mm, Red color)   Actual size of 0.9ct Diamond (emerald cut, 6.45×4.78mm, White 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 (emerald cut, 21.84×16.18mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 0.9ct Diamond (emerald cut, 6.45×4.78mm) 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
 96% vs 29%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 40ct Ruby Emerald (21.84×16.18mm, Red) and 0.9ct Diamond Emerald (6.45×4.78mm, 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, 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.


40 Ct Ruby (Emerald) 0.9 Ct Diamond (Emerald)
21.84×16.18 mm vs 6.45×4.78 mm
328.64 mm²   28.67 mm²
Face-up size outline for 40ct Ruby (21.84×16.18mm, emerald cut)
Face-up size outline for 0.9ct Diamond (6.45×4.78mm, emerald cut)
40ct Ruby Emerald (21.84×16.18mm)
0.9ct Diamond Emerald (6.45×4.78mm)
Difference: 1046% (299.97 mm²)
40ct Ruby (Emerald, 21.84×16.18mm) has approx. 1046% more face-up area than 0.9ct Diamond (Emerald, 6.45×4.78mm). In other words, it's 11.46x larger.


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