×
carat vs. color  length*  width*
  ×

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

25ct Ruby (Round, 17.48×17.48mm, Red) vs 25ct Diamond (Round, 19.01×19.01mm, White)


Quick summary: When looked from above (face-up position), 25ct Diamond (19.01×19.01mm, round cut) appears 18% larger than 25ct Ruby (17.48×17.48mm, round cut). See below how they compare side-by-side on a ring and finger.

25ct Ruby (round cut)
vs
 25ct Diamond (round cut)
red
 
white
17.48×17.48 mm 19.01×19.01 mm
actual size
Actual size of 25ct Ruby (round cut, 17.48×17.48mm, Red color)   Actual size of 25ct Diamond (round cut, 19.01×19.01mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Red 25ct Ruby (round cut, 17.48×17.48mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 25ct Diamond (round cut, 19.01×19.01mm) 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
 104% vs 113%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 25ct Ruby Round (17.48×17.48mm, Red) and 25ct Diamond Round (19.01×19.01mm, 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.


25 Ct Ruby (Round) 25 Ct Diamond (Round)
17.48×17.48 mm vs 19.01×19.01 mm
239.98 mm²   283.83 mm²
Face-up size outline for 25ct Diamond (19.01×19.01mm, round cut)
Face-up size outline for 25ct Ruby (17.48×17.48mm, round cut)
25ct Ruby Round (17.48×17.48mm)
25ct Diamond Round (19.01×19.01mm)
Difference: 18% (43.85 mm²)
25ct Diamond (Round, 19.01×19.01mm) has approx. 18% more face-up area than 25ct Ruby (Round, 17.48×17.48mm).


Popular comparisons: