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3ct Spinel (Trillion, 10.5×10.5mm, Red) vs 3ct Sapphire (Trillion, 10.14×10.14mm, Blue)


Quick summary: When looked from above (face-up position), 3ct Spinel (10.5×10.5mm, trillion cut) appears 7% larger than 3ct Sapphire (10.14×10.14mm, trillion cut). See below how they compare side-by-side on a ring and finger.

3ct Spinel (trillion cut)
vs
 3ct Sapphire (trillion cut)
red
 
blue
10.5×10.5 mm 10.14×10.14 mm
actual size
Actual size of 3ct Spinel (trillion cut, 10.5×10.5mm, Red color)   Actual size of 3ct Sapphire (trillion cut, 10.14×10.14mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Red 3ct Spinel (trillion cut, 10.5×10.5mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 3ct Sapphire (trillion cut, 10.14×10.14mm) 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
 63% vs 61%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 3ct Spinel Trillion (10.5×10.5mm, Red) and 3ct Sapphire Trillion (10.14×10.14mm, 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, Sapphire 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.


3 Ct Spinel (Trillion) 3 Ct Sapphire (Trillion)
10.5×10.5 mm vs 10.14×10.14 mm
68.36 mm²   63.75 mm²
Face-up size outline for 3ct Spinel (10.5×10.5mm, trillion cut)
Face-up size outline for 3ct Sapphire (10.14×10.14mm, trillion cut)
3ct Spinel Trillion (10.5×10.5mm)
3ct Sapphire Trillion (10.14×10.14mm)
Difference: 7% (4.61 mm²)
3ct Spinel (Trillion, 10.5×10.5mm) has approx. 7% more face-up area than 3ct Sapphire (Trillion, 10.14×10.14mm).


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