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18ct Rhodolite (Marquise, 25.82×12.91mm, Purple) vs 18ct Tourmaline (Marquise, 27.86×13.93mm, Purple)


Quick summary: When looked from above (face-up position), 18ct Tourmaline (27.86×13.93mm, marquise cut) appears 16% larger than 18ct Rhodolite (25.82×12.91mm, marquise cut). See below how they compare side-by-side on a ring and finger.

18ct Rhodolite (marquise cut)
vs
 18ct Tourmaline (marquise cut)
purple
 
purple
25.82×12.91 mm 27.86×13.93 mm
actual size
Actual size of 18ct Rhodolite (marquise cut, 25.82×12.91mm, Purple color)   Actual size of 18ct Tourmaline (marquise cut, 27.86×13.93mm, Purple color)
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Purple 18ct Rhodolite (marquise cut, 25.82×12.91mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Purple 18ct Tourmaline (marquise cut, 27.86×13.93mm) 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
 77% vs 83%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 18ct Rhodolite Marquise (25.82×12.91mm, Purple) and 18ct Tourmaline Marquise (27.86×13.93mm, Purple) 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, Rhodolite will face-up smaller than Tourmaline for a given carat weight, because it has higher specific gravity (3.84 vs. 3.06 - this means it's "heavier" compared to Tourmaline 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 Rhodolite (Marquise) 18 Ct Tourmaline (Marquise)
25.82×12.91 mm vs 27.86×13.93 mm
236.67 mm²   275.54 mm²
Face-up size outline for 18ct Tourmaline (27.86×13.93mm, marquise cut)
Face-up size outline for 18ct Rhodolite (25.82×12.91mm, marquise cut)
18ct Rhodolite Marquise (25.82×12.91mm)
18ct Tourmaline Marquise (27.86×13.93mm)
Difference: 16% (38.87 mm²)
18ct Tourmaline (Marquise, 27.86×13.93mm) has approx. 16% more face-up area than 18ct Rhodolite (Marquise, 25.82×12.91mm).


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