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8ct Sapphire (Oval, 15.12×10.08mm, Dark Blue) vs 8ct Spinel (Oval, 15.68×10.45mm, Dark Blue)


Quick summary: When looked from above (face-up position), 8ct Spinel (15.68×10.45mm, oval cut) appears 8% larger than 8ct Sapphire (15.12×10.08mm, oval cut). See below how they compare side-by-side on a ring and finger.

8ct Sapphire (oval cut)
vs
 8ct Spinel (oval cut)
dark blue
 
dark blue
15.12×10.08 mm 15.68×10.45 mm
actual size
Actual size of 8ct Sapphire (oval cut, 15.12×10.08mm, Dark Blue color)   Actual size of 8ct Spinel (oval cut, 15.68×10.45mm, Dark Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Dark Blue 8ct Sapphire (oval cut, 15.12×10.08mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Dark Blue 8ct Spinel (oval cut, 15.68×10.45mm) 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
 60% vs 62%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 8ct Sapphire Oval (15.12×10.08mm, Dark Blue) and 8ct Spinel Oval (15.68×10.45mm, Dark 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.


8 Ct Sapphire (Oval) 8 Ct Spinel (Oval)
15.12×10.08 mm vs 15.68×10.45 mm
124.98 mm²   134.36 mm²
Face-up size outline for 8ct Spinel (15.68×10.45mm, oval cut)
Face-up size outline for 8ct Sapphire (15.12×10.08mm, oval cut)
8ct Sapphire Oval (15.12×10.08mm)
8ct Spinel Oval (15.68×10.45mm)
Difference: 8% (9.38 mm²)
8ct Spinel (Oval, 15.68×10.45mm) has approx. 8% more face-up area than 8ct Sapphire (Oval, 15.12×10.08mm).


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