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0.25ct Ruby (Princess, 3.31×3.31mm, Red) vs 0.25ct Spinel (Princess, 3.43×3.43mm, Red)


Quick summary: When looked from above (face-up position), 0.25ct Spinel (3.43×3.43mm, princess cut) appears 7% larger than 0.25ct Ruby (3.31×3.31mm, princess cut). See below how they compare side-by-side on a ring and finger.

0.25ct Ruby (princess cut)
vs
 0.25ct Spinel (princess cut)
red
 
red
3.31×3.31 mm 3.43×3.43 mm
actual size
Actual size of 0.25ct Ruby (princess cut, 3.31×3.31mm, Red color)   Actual size of 0.25ct Spinel (princess cut, 3.43×3.43mm, 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 (princess cut, 3.31×3.31mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Red 0.25ct Spinel (princess cut, 3.43×3.43mm) 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
 20% vs 21%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 0.25ct Ruby Princess (3.31×3.31mm, Red) and 0.25ct Spinel Princess (3.43×3.43mm, 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 (Princess) 0.25 Ct Spinel (Princess)
3.31×3.31 mm vs 3.43×3.43 mm
10.96 mm²   11.76 mm²
Face-up size outline for 0.25ct Spinel (3.43×3.43mm, princess cut)
Face-up size outline for 0.25ct Ruby (3.31×3.31mm, princess cut)
0.25ct Ruby Princess (3.31×3.31mm)
0.25ct Spinel Princess (3.43×3.43mm)
Difference: 7% (0.8 mm²)
0.25ct Spinel (Princess, 3.43×3.43mm) has approx. 7% more face-up area than 0.25ct Ruby (Princess, 3.31×3.31mm).


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