×
carat vs. color  length*  width*
  ×

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

15ct Tourmaline (Oval, 20.67×13.78mm, Purple) vs 15ct Quartz (Oval, 21.69×14.46mm, Brown)


Quick summary: When looked from above (face-up position), 15ct Quartz (21.69×14.46mm, oval cut) appears 10% larger than 15ct Tourmaline (20.67×13.78mm, oval cut). See below how they compare side-by-side on a ring and finger.

15ct Tourmaline (oval cut)
vs
 15ct Quartz (oval cut)
purple
 
brown
20.67×13.78 mm 21.69×14.46 mm
actual size
Actual size of 15ct Tourmaline (oval cut, 20.67×13.78mm, Purple color)   Actual size of 15ct Quartz (oval cut, 21.69×14.46mm, Brown color)
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Purple 15ct Tourmaline (oval cut, 20.67×13.78mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Brown 15ct Quartz (oval cut, 21.69×14.46mm) 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 86%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 15ct Tourmaline Oval (20.67×13.78mm, Purple) and 15ct Quartz Oval (21.69×14.46mm, Brown) 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, Tourmaline will face-up smaller than Quartz for a given carat weight, because it has higher specific gravity (3.06 vs. 2.65 - this means it's "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.


15 Ct Tourmaline (Oval) 15 Ct Quartz (Oval)
20.67×13.78 mm vs 21.69×14.46 mm
233.56 mm²   257.18 mm²
Face-up size outline for 15ct Quartz (21.69×14.46mm, oval cut)
Face-up size outline for 15ct Tourmaline (20.67×13.78mm, oval cut)
15ct Tourmaline Oval (20.67×13.78mm)
15ct Quartz Oval (21.69×14.46mm)
Difference: 10% (23.62 mm²)
15ct Quartz (Oval, 21.69×14.46mm) has approx. 10% more face-up area than 15ct Tourmaline (Oval, 20.67×13.78mm).


Popular comparisons: