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0.25ct Ruby (Cabochon, 4.31×2.87mm, Red) vs 0.25ct Spinel (Cabochon, 4.47×2.98mm, Red)


Quick summary: When looked from above (face-up position), 0.25ct Spinel (4.47×2.98mm, cabochon cut) appears 8% larger than 0.25ct Ruby (4.31×2.87mm, cabochon cut). See below how they compare side-by-side on a ring and finger.

0.25ct Ruby (cabochon cut)
vs
 0.25ct Spinel (cabochon cut)
red
 
red
4.31×2.87 mm 4.47×2.98 mm
actual size
Actual size of 0.25ct Ruby (cabochon cut, 4.31×2.87mm, Red color)   Actual size of 0.25ct Spinel (cabochon cut, 4.47×2.98mm, Red color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Red 0.25ct Ruby (cabochon cut, 4.31×2.87mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Red 0.25ct Spinel (cabochon cut, 4.47×2.98mm) 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
 17% vs 18%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 0.25ct Ruby Cabochon (4.31×2.87mm, Red) and 0.25ct Spinel Cabochon (4.47×2.98mm, 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, Ruby will face-up smaller than Spinel for a given carat weight, because it has higher specific gravity (4 vs. 3.6 - this means it's "heavier" compared to Spinel 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.


0.25 Ct Ruby (Cabochon) 0.25 Ct Spinel (Cabochon)
4.31×2.87 mm vs 4.47×2.98 mm
10.14 mm²   10.92 mm²
Face-up size outline for 0.25ct Spinel (4.47×2.98mm, cabochon cut)
Face-up size outline for 0.25ct Ruby (4.31×2.87mm, cabochon cut)
0.25ct Ruby Cabochon (4.31×2.87mm)
0.25ct Spinel Cabochon (4.47×2.98mm)
Difference: 8% (0.78 mm²)
0.25ct Spinel (Cabochon, 4.47×2.98mm) has approx. 8% more face-up area than 0.25ct Ruby (Cabochon, 4.31×2.87mm).


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