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13ct Quartz (Cabochon, 18.47×12.31mm, Brown) vs 13ct Andesine (Cabochon, 18.41×12.27mm, Orange)


Quick summary: When looked from above (face-up position), 13ct Quartz (18.47×12.31mm, cabochon cut) appears 0.7% larger than 13ct Andesine (18.41×12.27mm, cabochon cut). See below how they compare side-by-side on a ring and finger.

13ct Quartz (cabochon cut)
vs
 13ct Andesine (cabochon cut)
brown
 
orange
18.47×12.31 mm 18.41×12.27 mm
actual size
Actual size of 13ct Quartz (cabochon cut, 18.47×12.31mm, Brown color)   Actual size of 13ct Andesine (cabochon cut, 18.41×12.27mm, Orange color)
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Brown 13ct Quartz (cabochon cut, 18.47×12.31mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Orange 13ct Andesine (cabochon cut, 18.41×12.27mm) 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
 73% vs 73%
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Ring diameter: 16.9 mm
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Actual sizes of 13ct Quartz Cabochon (18.47×12.31mm, Brown) and 13ct Andesine Cabochon (18.41×12.27mm, 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, Andesine will face-up slightly smaller than Quartz for a given carat weight, because it has higher specific gravity (2.67 vs. 2.65 - this means it's "slightly heavier" compared to Quartz 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.


13 Ct Quartz (Cabochon) 13 Ct Andesine (Cabochon)
18.47×12.31 mm vs 18.41×12.27 mm
186.44 mm²   185.23 mm²
Face-up size outline for 13ct Quartz (18.47×12.31mm, cabochon cut)
Face-up size outline for 13ct Andesine (18.41×12.27mm, cabochon cut)
13ct Quartz Cabochon (18.47×12.31mm)
13ct Andesine Cabochon (18.41×12.27mm)
Difference: 0.7% (1.21 mm²)
13ct Quartz (Cabochon, 18.47×12.31mm) has approx. 0.7% more face-up area than 13ct Andesine (Cabochon, 18.41×12.27mm).


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