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0.3ct Diamond (Pear, 6.06×3.65mm, White) vs 0.5ct Ruby (Round, 4.75×4.75mm, Red)


Quick summary: When looked from above (face-up position), 0.5ct Ruby (4.75×4.75mm, round cut) appears 10% larger than 0.3ct Diamond (6.06×3.65mm, pear cut). See below how they compare side-by-side on a ring and finger.

0.3ct Diamond (pear cut)
vs
 0.5ct Ruby (round cut)
white
 
red
6.06×3.65 mm 4.75×4.75 mm
actual size
Actual size of 0.3ct Diamond (pear cut, 6.06×3.65mm, White color)   Actual size of 0.5ct Ruby (round cut, 4.75×4.75mm, Red color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 0.3ct Diamond (pear cut, 6.06×3.65mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Red 0.5ct Ruby (round cut, 4.75×4.75mm) 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
 22% vs 29%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 0.3ct Diamond Pear (6.06×3.65mm, White) and 0.5ct Ruby Round (4.75×4.75mm, Red) 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.


0.3 Ct Diamond (Pear) 0.5 Ct Ruby (Round)
6.06×3.65 mm vs 4.75×4.75 mm
16.15 mm²   17.72 mm²
Face-up size outline for 0.5ct Ruby (4.75×4.75mm, round cut)
Face-up size outline for 0.3ct Diamond (6.06×3.65mm, pear cut)
0.3ct Diamond Pear (6.06×3.65mm)
0.5ct Ruby Round (4.75×4.75mm)
Difference: 10% (1.57 mm²)
0.5ct Ruby (Round, 4.75×4.75mm) has approx. 10% more face-up area than 0.3ct Diamond (Pear, 6.06×3.65mm).


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