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9ct Amethyst (Marquise, 23.2×11.6mm, Violet) vs 9ct Tanzanite (Marquise, 21.46×10.73mm, Blue)


Quick summary: When looked from above (face-up position), 9ct Amethyst (23.2×11.6mm, marquise cut) appears 17% larger than 9ct Tanzanite (21.46×10.73mm, marquise cut). See below how they compare side-by-side on a ring and finger.

9ct Amethyst (marquise cut)
vs
 9ct Tanzanite (marquise cut)
violet
 
blue
23.2×11.6 mm 21.46×10.73 mm
actual size
Actual size of 9ct Amethyst (marquise cut, 23.2×11.6mm, Violet color)   Actual size of 9ct Tanzanite (marquise cut, 21.46×10.73mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Violet 9ct Amethyst (marquise cut, 23.2×11.6mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 9ct Tanzanite (marquise cut, 21.46×10.73mm) 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
 69% vs 64%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 9ct Amethyst Marquise (23.2×11.6mm, Violet) and 9ct Tanzanite Marquise (21.46×10.73mm, 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, Tanzanite will face-up smaller than Amethyst for a given carat weight, because it has higher specific gravity (3.35 vs. 2.65 - this means it's "heavier" compared to Amethyst 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.


9 Ct Amethyst (Marquise) 9 Ct Tanzanite (Marquise)
23.2×11.6 mm vs 21.46×10.73 mm
191.08 mm²   163.49 mm²
Face-up size outline for 9ct Amethyst (23.2×11.6mm, marquise cut)
Face-up size outline for 9ct Tanzanite (21.46×10.73mm, marquise cut)
9ct Amethyst Marquise (23.2×11.6mm)
9ct Tanzanite Marquise (21.46×10.73mm)
Difference: 17% (27.59 mm²)
9ct Amethyst (Marquise, 23.2×11.6mm) has approx. 17% more face-up area than 9ct Tanzanite (Marquise, 21.46×10.73mm).


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