×
carat vs. color  length*  width*
  ×

(or examine a )
* size in mm (optional)

18ct Quartz (Cabochon, 20.58×13.72mm, Brown) vs 18ct Andesine (Cabochon, 20.52×13.68mm, Orange)


Quick summary: When looked from above (face-up position), 18ct Quartz (20.58×13.72mm, cabochon cut) appears 0.6% larger than 18ct Andesine (20.52×13.68mm, cabochon cut). See below how they compare side-by-side on a ring and finger.

18ct Quartz (cabochon cut)
vs
 18ct Andesine (cabochon cut)
brown
 
orange
20.58×13.72 mm 20.52×13.68 mm
actual size
Actual size of 18ct Quartz (cabochon cut, 20.58×13.72mm, Brown 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
Brown 18ct Quartz (cabochon cut, 20.58×13.72mm) 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
 82% vs 81%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 18ct Quartz Cabochon (20.58×13.72mm, Brown) 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, 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.


18 Ct Quartz (Cabochon) 18 Ct Andesine (Cabochon)
20.58×13.72 mm vs 20.52×13.68 mm
231.53 mm²   230.19 mm²
Face-up size outline for 18ct Quartz (20.58×13.72mm, cabochon cut)
Face-up size outline for 18ct Andesine (20.52×13.68mm, cabochon cut)
18ct Quartz Cabochon (20.58×13.72mm)
18ct Andesine Cabochon (20.52×13.68mm)
Difference: 0.6% (1.34 mm²)
18ct Quartz (Cabochon, 20.58×13.72mm) has approx. 0.6% more face-up area than 18ct Andesine (Cabochon, 20.52×13.68mm).


Popular comparisons: