×
carat vs. color  length*  width*
  ×

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

1ct Ruby (Marquise, 9.88×4.94mm, Red) vs 1.21ct Diamond (Marquise, 11.06×5.53mm, White)


Quick summary: When looked from above (face-up position), 1.21ct Diamond (11.06×5.53mm, marquise cut) appears 25% larger than 1ct Ruby (9.88×4.94mm, marquise cut). See below how they compare side-by-side on a ring and finger.

1ct Ruby (marquise cut)
vs
 1.21ct Diamond (marquise cut)
red
 
white
9.88×4.94 mm 11.06×5.53 mm
actual size
Actual size of 1ct Ruby (marquise cut, 9.88×4.94mm, Red color)   Actual size of 1.21ct Diamond (marquise cut, 11.06×5.53mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Red 1ct Ruby (marquise cut, 9.88×4.94mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 1.21ct Diamond (marquise cut, 11.06×5.53mm) 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
 30% vs 33%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 1ct Ruby Marquise (9.88×4.94mm, Red) and 1.21ct Diamond Marquise (11.06×5.53mm, 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.


1 Ct Ruby (Marquise) 1.21 Ct Diamond (Marquise)
9.88×4.94 mm vs 11.06×5.53 mm
34.65 mm²   43.42 mm²
Face-up size outline for 1.21ct Diamond (11.06×5.53mm, marquise cut)
Face-up size outline for 1ct Ruby (9.88×4.94mm, marquise cut)
1ct Ruby Marquise (9.88×4.94mm)
1.21ct Diamond Marquise (11.06×5.53mm)
Difference: 25% (8.77 mm²)
1.21ct Diamond (Marquise, 11.06×5.53mm) has approx. 25% more face-up area than 1ct Ruby (Marquise, 9.88×4.94mm).


Popular comparisons: