×
carat vs. color  length*  width*
  ×

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

3ct Ruby (Cushion, 8.06×8.06mm, Red) vs 3ct Tanzanite (Cushion, 8.6×8.6mm, Blue)


Quick summary: When looked from above (face-up position), 3ct Tanzanite (8.6×8.6mm, cushion cut) appears 14% larger than 3ct Ruby (8.06×8.06mm, cushion cut). See below how they compare side-by-side on a ring and finger.

3ct Ruby (cushion cut)
vs
3ct Tanzanite (cushion cut)
red
 
blue
8.06×8.06 mm 8.6×8.6 mm
actual size
Actual size of 3ct Ruby (cushion cut, 8.06×8.06mm, Red color)   Actual size of 3ct Tanzanite (cushion cut, 8.6×8.6mm, Blue color)
 
Actual size is set for screen Change
Settings
Ring: Skin tone:
Ring width: 3.0 mm
Saved...
Left finger image
Ring on left finger
Red 3ct Ruby (cushion cut, 8.06×8.06mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 3ct Tanzanite (cushion cut, 8.6×8.6mm) 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
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 3ct Ruby Cushion (8.06×8.06mm, Red) and 3ct Tanzanite Cushion (8.6×8.6mm, Blue) 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 Tanzanite for a given carat weight, because it has higher specific gravity (4 vs. 3.3 - this means it's "heavier" compared to Tanzanite 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.


3 Ct Ruby (Cushion) 3 Ct Tanzanite (Cushion)
8.06×8.06 mm vs 8.6×8.6 mm
58.47 mm²   66.56 mm²
Face-up size outline for 3ct Tanzanite (8.6×8.6mm, cushion cut)
Face-up size outline for 3ct Ruby (8.06×8.06mm, cushion cut)
3ct Ruby Cushion (8.06×8.06mm)
3ct Tanzanite Cushion (8.6×8.6mm)
Difference: 14% (8.09 mm²)
3ct Tanzanite Cushion (8.6×8.6mm) has approx. 14% more face-up area than 3ct Ruby Cushion (8.06×8.06mm).


Popular comparisons:

Enter your screen size (diagonal)

My screen size is  inches



Actual size is currently adjusted to screen.

If your screen (phone, tablet, or monitor) is not in diagonal, then the actual size of a gem, ring and finger will not be shown correctly.