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0.45ct Ruby (Round, 4.58×4.58mm, Red) vs 0.25ct Diamond (Marquise, 6.54×3.27mm, White)


Quick summary: When looked from above (face-up position), 0.45ct Ruby (4.58×4.58mm, round cut) appears 8% larger than 0.25ct Diamond (6.54×3.27mm, marquise cut). See below how they compare side-by-side on a ring and finger.

0.45ct Ruby (round cut)
vs
 0.25ct Diamond (marquise cut)
red
 
white
4.58×4.58 mm 6.54×3.27 mm
actual size
Actual size of 0.45ct Ruby (round cut, 4.58×4.58mm, Red color)   Actual size of 0.25ct Diamond (marquise cut, 6.54×3.27mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Red 0.45ct Ruby (round cut, 4.58×4.58mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 0.25ct Diamond (marquise cut, 6.54×3.27mm) 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 20%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 0.45ct Ruby Round (4.58×4.58mm, Red) and 0.25ct Diamond Marquise (6.54×3.27mm, 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.


0.45 Ct Ruby (Round) 0.25 Ct Diamond (Marquise)
4.58×4.58 mm vs 6.54×3.27 mm
16.47 mm²   15.18 mm²
Face-up size outline for 0.45ct Ruby (4.58×4.58mm, round cut)
Face-up size outline for 0.25ct Diamond (6.54×3.27mm, marquise cut)
0.45ct Ruby Round (4.58×4.58mm)
0.25ct Diamond Marquise (6.54×3.27mm)
Difference: 8% (1.29 mm²)
0.45ct Ruby (Round, 4.58×4.58mm) has approx. 8% more face-up area than 0.25ct Diamond (Marquise, 6.54×3.27mm).


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