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20ct Tourmaline (Trillion, 21.7×21.7mm, Purple) vs 20ct Quartz (Trillion, 22.76×22.76mm, Brown)


Quick summary: When looked from above (face-up position), 20ct Quartz (22.76×22.76mm, trillion cut) appears 10% larger than 20ct Tourmaline (21.7×21.7mm, trillion cut). See below how they compare side-by-side on a ring and finger.

20ct Tourmaline (trillion cut)
vs
 20ct Quartz (trillion cut)
purple
 
brown
21.7×21.7 mm 22.76×22.76 mm
actual size
Actual size of 20ct Tourmaline (trillion cut, 21.7×21.7mm, Purple color)   Actual size of 20ct Quartz (trillion cut, 22.76×22.76mm, 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 (trillion cut, 21.7×21.7mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Brown 20ct Quartz (trillion cut, 22.76×22.76mm) 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
 129% vs 135%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 20ct Tourmaline Trillion (21.7×21.7mm, Purple) and 20ct Quartz Trillion (22.76×22.76mm, 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 (Trillion) 20 Ct Quartz (Trillion)
21.7×21.7 mm vs 22.76×22.76 mm
291.95 mm²   321.17 mm²
Face-up size outline for 20ct Quartz (22.76×22.76mm, trillion cut)
Face-up size outline for 20ct Tourmaline (21.7×21.7mm, trillion cut)
20ct Tourmaline Trillion (21.7×21.7mm)
20ct Quartz Trillion (22.76×22.76mm)
Difference: 10% (29.22 mm²)
20ct Quartz (Trillion, 22.76×22.76mm) has approx. 10% more face-up area than 20ct Tourmaline (Trillion, 21.7×21.7mm).


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