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18ct Spinel (Cabochon, 18.57×12.38mm, Red) vs 18ct Andesine (Cabochon, 20.52×13.68mm, Orange)


Quick summary: When looked from above (face-up position), 18ct Andesine (20.52×13.68mm, cabochon cut) appears 22% larger than 18ct Spinel (18.57×12.38mm, cabochon cut). See below how they compare side-by-side on a ring and finger.

18ct Spinel (cabochon cut)
vs
 18ct Andesine (cabochon cut)
red
 
orange
18.57×12.38 mm 20.52×13.68 mm
actual size
Actual size of 18ct Spinel (cabochon cut, 18.57×12.38mm, Red color)   Actual size of 18ct Andesine (cabochon cut, 20.52×13.68mm, Orange color)
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Red 18ct Spinel (cabochon cut, 18.57×12.38mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Orange 18ct Andesine (cabochon cut, 20.52×13.68mm) 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
 74% vs 81%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 18ct Spinel Cabochon (18.57×12.38mm, Red) and 18ct Andesine Cabochon (20.52×13.68mm, Orange) 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, Spinel will face-up smaller than Andesine for a given carat weight, because it has higher specific gravity (3.6 vs. 2.67 - this means it's "heavier" compared to Andesine 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.


18 Ct Spinel (Cabochon) 18 Ct Andesine (Cabochon)
18.57×12.38 mm vs 20.52×13.68 mm
188.52 mm²   230.19 mm²
Face-up size outline for 18ct Andesine (20.52×13.68mm, cabochon cut)
Face-up size outline for 18ct Spinel (18.57×12.38mm, cabochon cut)
18ct Spinel Cabochon (18.57×12.38mm)
18ct Andesine Cabochon (20.52×13.68mm)
Difference: 22% (41.67 mm²)
18ct Andesine (Cabochon, 20.52×13.68mm) has approx. 22% more face-up area than 18ct Spinel (Cabochon, 18.57×12.38mm).


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