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0.8ct Ruby (Oval, 7.02×4.68mm, Red) vs 0.38ct Diamond (Round, 4.71×4.71mm, White)


Quick summary: When looked from above (face-up position), 0.8ct Ruby (7.02×4.68mm, oval cut) appears 55% larger than 0.38ct Diamond (4.71×4.71mm, round cut). See below how they compare side-by-side on a ring and finger.

0.8ct Ruby (oval cut)
vs
 0.38ct Diamond (round cut)
red
 
white
7.02×4.68 mm 4.71×4.71 mm
actual size
Actual size of 0.8ct Ruby (oval cut, 7.02×4.68mm, Red color)   Actual size of 0.38ct Diamond (round cut, 4.71×4.71mm, 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 (oval cut, 7.02×4.68mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 0.38ct Diamond (round cut, 4.71×4.71mm) 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
 28% vs 28%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 0.8ct Ruby Oval (7.02×4.68mm, Red) and 0.38ct Diamond Round (4.71×4.71mm, 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 (Oval) 0.38 Ct Diamond (Round)
7.02×4.68 mm vs 4.71×4.71 mm
26.94 mm²   17.42 mm²
Face-up size outline for 0.8ct Ruby (7.02×4.68mm, oval cut)
Face-up size outline for 0.38ct Diamond (4.71×4.71mm, round cut)
0.8ct Ruby Oval (7.02×4.68mm)
0.38ct Diamond Round (4.71×4.71mm)
Difference: 55% (9.52 mm²)
0.8ct Ruby (Oval, 7.02×4.68mm) has approx. 55% more face-up area than 0.38ct Diamond (Round, 4.71×4.71mm).


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