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20ct Tourmaline (Oval, 22.76×15.17mm, Purple) vs 20ct Quartz (Oval, 23.88×15.92mm, Brown)


Quick summary: When looked from above (face-up position), 20ct Quartz (23.88×15.92mm, oval cut) appears 10% larger than 20ct Tourmaline (22.76×15.17mm, oval cut). See below how they compare side-by-side on a ring and finger.

20ct Tourmaline (oval cut)
vs
 20ct Quartz (oval cut)
purple
 
brown
22.76×15.17 mm 23.88×15.92 mm
actual size
Actual size of 20ct Tourmaline (oval cut, 22.76×15.17mm, Purple color)   Actual size of 20ct Quartz (oval cut, 23.88×15.92mm, Brown color)
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Purple 20ct Tourmaline (oval cut, 22.76×15.17mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Brown 20ct Quartz (oval cut, 23.88×15.92mm) 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
 90% vs 95%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 20ct Tourmaline Oval (22.76×15.17mm, Purple) and 20ct Quartz Oval (23.88×15.92mm, 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.


20 Ct Tourmaline (Oval) 20 Ct Quartz (Oval)
22.76×15.17 mm vs 23.88×15.92 mm
283.12 mm²   311.74 mm²
Face-up size outline for 20ct Quartz (23.88×15.92mm, oval cut)
Face-up size outline for 20ct Tourmaline (22.76×15.17mm, oval cut)
20ct Tourmaline Oval (22.76×15.17mm)
20ct Quartz Oval (23.88×15.92mm)
Difference: 10% (28.62 mm²)
20ct Quartz (Oval, 23.88×15.92mm) has approx. 10% more face-up area than 20ct Tourmaline (Oval, 22.76×15.17mm).


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