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15ct Tourmaline (Marquise, 26.22×13.11mm, Purple) vs 15ct Quartz (Marquise, 27.5×13.75mm, Brown)


Quick summary: When looked from above (face-up position), 15ct Quartz (27.5×13.75mm, marquise cut) appears 10% larger than 15ct Tourmaline (26.22×13.11mm, marquise cut). See below how they compare side-by-side on a ring and finger.

15ct Tourmaline (marquise cut)
vs
 15ct Quartz (marquise cut)
purple
 
brown
26.22×13.11 mm 27.5×13.75 mm
actual size
Actual size of 15ct Tourmaline (marquise cut, 26.22×13.11mm, Purple color)   Actual size of 15ct Quartz (marquise cut, 27.5×13.75mm, 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 (marquise cut, 26.22×13.11mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Brown 15ct Quartz (marquise cut, 27.5×13.75mm) 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
 78% vs 82%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 15ct Tourmaline Marquise (26.22×13.11mm, Purple) and 15ct Quartz Marquise (27.5×13.75mm, 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 (Marquise) 15 Ct Quartz (Marquise)
26.22×13.11 mm vs 27.5×13.75 mm
244.06 mm²   268.47 mm²
Face-up size outline for 15ct Quartz (27.5×13.75mm, marquise cut)
Face-up size outline for 15ct Tourmaline (26.22×13.11mm, marquise cut)
15ct Tourmaline Marquise (26.22×13.11mm)
15ct Quartz Marquise (27.5×13.75mm)
Difference: 10% (24.41 mm²)
15ct Quartz (Marquise, 27.5×13.75mm) has approx. 10% more face-up area than 15ct Tourmaline (Marquise, 26.22×13.11mm).


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