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0.6ct Ruby (Round, 5.04×5.04mm, Red) vs 0.3ct Diamond (Round, 4.35×4.35mm, White)


Quick summary: When looked from above (face-up position), 0.6ct Ruby (5.04×5.04mm, round cut) appears 34% larger than 0.3ct Diamond (4.35×4.35mm, round cut). See below how they compare side-by-side on a ring and finger. 

0.6ct Ruby (round cut)
vs
0.3ct Diamond (round cut)
red
 
white
5.04×5.04 mm 4.35×4.35 mm
actual size
Actual size of 0.6ct Ruby (round cut, 5.04×5.04mm, Red color)   Actual size of 0.3ct Diamond (round cut, 4.35×4.35mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Red 0.6ct Ruby (round cut, 5.04×5.04mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 0.3ct Diamond (round cut, 4.35×4.35mm) 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
30% vs 26%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 0.6ct Ruby Round (5.04×5.04mm, Red) and 0.3ct Diamond Round (4.35×4.35mm, 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.


0.6 Ct Ruby (Round) 0.3 Ct Diamond (Round)
5.04×5.04 mm vs 4.35×4.35 mm
19.95 mm²   14.86 mm²
Face-up size outline for 0.6ct Ruby (5.04×5.04mm, round cut)
Face-up size outline for 0.3ct Diamond (4.35×4.35mm, round cut)
0.6ct Ruby Round (5.04×5.04mm)
0.3ct Diamond Round (4.35×4.35mm)
Difference: 34% (5.09 mm²)
0.6ct Ruby (Round, 5.04×5.04mm) has approx. 34% more face-up area than 0.3ct Diamond (Round, 4.35×4.35mm).


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