×
carat vs. color  length*  width*
  ×

(or examine a )
* size in mm (optional)

0.3ct Diamond (Marquise, 6.96×3.48mm, White) vs 0.45ct Ruby (Round, 4.58×4.58mm, Red)


Quick summary: When looked from above (face-up position), 0.3ct Diamond (6.96×3.48mm, marquise cut) appears 4% larger than 0.45ct Ruby (4.58×4.58mm, round cut). See below how they compare side-by-side on a ring and finger.

0.3ct Diamond (marquise cut)
vs
 0.45ct Ruby (round cut)
white
 
red
6.96×3.48 mm 4.58×4.58 mm
actual size
Actual size of 0.3ct Diamond (marquise cut, 6.96×3.48mm, White color)   Actual size of 0.45ct Ruby (round cut, 4.58×4.58mm, 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 (marquise cut, 6.96×3.48mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Red 0.45ct Ruby (round cut, 4.58×4.58mm) 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
 21% vs 28%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 0.3ct Diamond Marquise (6.96×3.48mm, White) and 0.45ct Ruby Round (4.58×4.58mm, 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 (Marquise) 0.45 Ct Ruby (Round)
6.96×3.48 mm vs 4.58×4.58 mm
17.2 mm²   16.47 mm²
Face-up size outline for 0.3ct Diamond (6.96×3.48mm, marquise cut)
Face-up size outline for 0.45ct Ruby (4.58×4.58mm, round cut)
0.3ct Diamond Marquise (6.96×3.48mm)
0.45ct Ruby Round (4.58×4.58mm)
Difference: 4% (0.73 mm²)
0.3ct Diamond (Marquise, 6.96×3.48mm) has approx. 4% more face-up area than 0.45ct Ruby (Round, 4.58×4.58mm).


Popular comparisons: