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0.5ct Ruby (Oval, 6×4mm, Red) vs 0.5ct Diamond (Round, 5.16×5.16mm, White)


Quick summary: When looked from above (face-up position), 0.5ct Diamond (5.16×5.16mm, round cut) appears 6% larger than 0.5ct Ruby (6×4mm, oval cut). See below how they compare side-by-side on a ring and finger.

0.5ct Ruby (oval cut)
vs
 0.5ct Diamond (round cut)
red
 
white
6×4 mm 5.16×5.16 mm
actual size
Actual size of 0.5ct Ruby (oval cut, 6×4mm, Red color)   Actual size of 0.5ct Diamond (round cut, 5.16×5.16mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Red 0.5ct Ruby (oval cut, 6×4mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 0.5ct Diamond (round cut, 5.16×5.16mm) 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
 24% vs 31%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 0.5ct Ruby Oval (6×4mm, Red) and 0.5ct Diamond Round (5.16×5.16mm, 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.


0.5 Ct Ruby (Oval) 0.5 Ct Diamond (Round)
6×4 mm vs 5.16×5.16 mm
19.68 mm²   20.91 mm²
Face-up size outline for 0.5ct Diamond (5.16×5.16mm, round cut)
Face-up size outline for 0.5ct Ruby (6×4mm, oval cut)
0.5ct Ruby Oval (6×4mm)
0.5ct Diamond Round (5.16×5.16mm)
Difference: 6% (1.23 mm²)
0.5ct Diamond (Round, 5.16×5.16mm) has approx. 6% more face-up area than 0.5ct Ruby (Oval, 6×4mm).


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