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0.8ct Ruby (Round, 5.55×5.55mm, Red) vs 0.8ct Diamond (Emerald, 6.2×4.59mm, White)


Quick summary: When looked from above (face-up position), 0.8ct Diamond (6.2×4.59mm, emerald cut) appears 9% larger than 0.8ct Ruby (5.55×5.55mm, round cut). See below how they compare side-by-side on a ring and finger.

0.8ct Ruby (round cut)
vs
 0.8ct Diamond (emerald cut)
red
 
white
5.55×5.55 mm 6.2×4.59 mm
actual size
Actual size of 0.8ct Ruby (round cut, 5.55×5.55mm, Red color)   Actual size of 0.8ct Diamond (emerald cut, 6.2×4.59mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Red 0.8ct Ruby (round cut, 5.55×5.55mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 0.8ct Diamond (emerald cut, 6.2×4.59mm) 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
 33% vs 28%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 0.8ct Ruby Round (5.55×5.55mm, Red) and 0.8ct Diamond Emerald (6.2×4.59mm, 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.


0.8 Ct Ruby (Round) 0.8 Ct Diamond (Emerald)
5.55×5.55 mm vs 6.2×4.59 mm
24.19 mm²   26.47 mm²
Face-up size outline for 0.8ct Diamond (6.2×4.59mm, emerald cut)
Face-up size outline for 0.8ct Ruby (5.55×5.55mm, round cut)
0.8ct Ruby Round (5.55×5.55mm)
0.8ct Diamond Emerald (6.2×4.59mm)
Difference: 9% (2.28 mm²)
0.8ct Diamond (Emerald, 6.2×4.59mm) has approx. 9% more face-up area than 0.8ct Ruby (Round, 5.55×5.55mm).


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