×
carat vs. color  length*  width*
  ×

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

5ct Ruby (Marquise, 16.88×8.44mm, Red) vs 0.25ct Diamond (Round, 4.09×4.09mm, White)


Quick summary: When looked from above (face-up position), 5ct Ruby (16.88×8.44mm, marquise cut) appears 7.7 times larger than 0.25ct Diamond (4.09×4.09mm, round cut). See below how they compare side-by-side on a ring and finger.

5ct Ruby (marquise cut)
vs
 0.25ct Diamond (round cut)
red
 
white
16.88×8.44 mm 4.09×4.09 mm
actual size
Actual size of 5ct Ruby (marquise cut, 16.88×8.44mm, Red color)   Actual size of 0.25ct Diamond (round cut, 4.09×4.09mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Red 5ct Ruby (marquise cut, 16.88×8.44mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 0.25ct Diamond (round cut, 4.09×4.09mm) 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
 50% vs 25%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 5ct Ruby Marquise (16.88×8.44mm, Red) and 0.25ct Diamond Round (4.09×4.09mm, 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.


5 Ct Ruby (Marquise) 0.25 Ct Diamond (Round)
16.88×8.44 mm vs 4.09×4.09 mm
101.15 mm²   13.14 mm²
Face-up size outline for 5ct Ruby (16.88×8.44mm, marquise cut)
Face-up size outline for 0.25ct Diamond (4.09×4.09mm, round cut)
5ct Ruby Marquise (16.88×8.44mm)
0.25ct Diamond Round (4.09×4.09mm)
Difference: 670% (88.01 mm²)
5ct Ruby (Marquise, 16.88×8.44mm) has approx. 670% more face-up area than 0.25ct Diamond (Round, 4.09×4.09mm). In other words, it's 7.7x larger.


Popular comparisons: