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0.25ct Tourmaline (Marquise, 6.7×3.35mm, Purple) vs 0.25ct Topaz (Marquise, 6.38×3.19mm, Blue)


Quick summary: When looked from above (face-up position), 0.25ct Tourmaline (6.7×3.35mm, marquise cut) appears 10% larger than 0.25ct Topaz (6.38×3.19mm, marquise cut). See below how they compare side-by-side on a ring and finger.

0.25ct Tourmaline (marquise cut)
vs
 0.25ct Topaz (marquise cut)
purple
 
blue
6.7×3.35 mm 6.38×3.19 mm
actual size
Actual size of 0.25ct Tourmaline (marquise cut, 6.7×3.35mm, Purple color)   Actual size of 0.25ct Topaz (marquise cut, 6.38×3.19mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Purple 0.25ct Tourmaline (marquise cut, 6.7×3.35mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 0.25ct Topaz (marquise cut, 6.38×3.19mm) 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
 20% vs 19%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 0.25ct Tourmaline Marquise (6.7×3.35mm, Purple) and 0.25ct Topaz Marquise (6.38×3.19mm, Blue) 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, Topaz will face-up smaller than Tourmaline for a given carat weight, because it has higher specific gravity (3.53 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.


0.25 Ct Tourmaline (Marquise) 0.25 Ct Topaz (Marquise)
6.7×3.35 mm vs 6.38×3.19 mm
15.94 mm²   14.45 mm²
Face-up size outline for 0.25ct Tourmaline (6.7×3.35mm, marquise cut)
Face-up size outline for 0.25ct Topaz (6.38×3.19mm, marquise cut)
0.25ct Tourmaline Marquise (6.7×3.35mm)
0.25ct Topaz Marquise (6.38×3.19mm)
Difference: 10% (1.49 mm²)
0.25ct Tourmaline (Marquise, 6.7×3.35mm) has approx. 10% more face-up area than 0.25ct Topaz (Marquise, 6.38×3.19mm).


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