×
carat vs. color  length*  width*
  ×

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

13ct Almandine (Radiant, 12.9×12.9mm, Dark Red) vs 13ct Ruby (Radiant, 12.95×12.95mm, Red)


Quick summary: When looked from above (face-up position), 13ct Ruby (12.95×12.95mm, radiant cut) appears 0.8% larger than 13ct Almandine (12.9×12.9mm, radiant cut). See below how they compare side-by-side on a ring and finger.

13ct Almandine (radiant cut)
vs
 13ct Ruby (radiant cut)
dark red
 
red
12.9×12.9 mm 12.95×12.95 mm
actual size
Actual size of 13ct Almandine (radiant cut, 12.9×12.9mm, Dark Red color)   Actual size of 13ct Ruby (radiant cut, 12.95×12.95mm, Red color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Dark Red 13ct Almandine (radiant cut, 12.9×12.9mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Red 13ct Ruby (radiant cut, 12.95×12.95mm) 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
 77% vs 77%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 13ct Almandine Radiant (12.9×12.9mm, Dark Red) and 13ct Ruby Radiant (12.95×12.95mm, 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, Almandine will face-up slightly smaller than Ruby for a given carat weight, because it has higher specific gravity (4.05 vs. 4 - this means it's "slightly heavier" compared to Ruby 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.


13 Ct Almandine (Radiant) 13 Ct Ruby (Radiant)
12.9×12.9 mm vs 12.95×12.95 mm
158.09 mm²   159.32 mm²
Face-up size outline for 13ct Ruby (12.95×12.95mm, radiant cut)
Face-up size outline for 13ct Almandine (12.9×12.9mm, radiant cut)
13ct Almandine Radiant (12.9×12.9mm)
13ct Ruby Radiant (12.95×12.95mm)
Difference: 0.8% (1.23 mm²)
13ct Ruby (Radiant, 12.95×12.95mm) has approx. 0.8% more face-up area than 13ct Almandine (Radiant, 12.9×12.9mm).


Popular comparisons: