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1ct Tanzanite (Marquise, 12×6mm, Blue) vs 1ct Amethyst (Pear, 9.53×5.74mm, Violet)


Quick summary: When looked from above (face-up position), 1ct Tanzanite (12×6mm, marquise cut) appears 28% larger than 1ct Amethyst (9.53×5.74mm, pear cut). See below how they compare side-by-side on a ring and finger.

1ct Tanzanite (marquise cut)
vs
 1ct Amethyst (pear cut)
blue
 
violet
12×6 mm 9.53×5.74 mm
actual size
Actual size of 1ct Tanzanite (marquise cut, 12×6mm, Blue color)   Actual size of 1ct Amethyst (pear cut, 9.53×5.74mm, Violet color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 1ct Tanzanite (marquise cut, 12×6mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Violet 1ct Amethyst (pear cut, 9.53×5.74mm) 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
 36% vs 34%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 1ct Tanzanite Marquise (12×6mm, Blue) and 1ct Amethyst Pear (9.53×5.74mm, Violet) 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.


1 Ct Tanzanite (Marquise) 1 Ct Amethyst (Pear)
12×6 mm vs 9.53×5.74 mm
51.12 mm²   39.93 mm²
Face-up size outline for 1ct Tanzanite (12×6mm, marquise cut)
Face-up size outline for 1ct Amethyst (9.53×5.74mm, pear cut)
1ct Tanzanite Marquise (12×6mm)
1ct Amethyst Pear (9.53×5.74mm)
Difference: 28% (11.19 mm²)
1ct Tanzanite (Marquise, 12×6mm) has approx. 28% more face-up area than 1ct Amethyst (Pear, 9.53×5.74mm).


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