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8.5ct Amethyst (Asscher, 12.48×12.48mm, Violet) vs 8.5ct Tanzanite (Asscher, 11.54×11.54mm, Blue)


Quick summary: When looked from above (face-up position), 8.5ct Amethyst (12.48×12.48mm, asscher cut) appears 17% larger than 8.5ct Tanzanite (11.54×11.54mm, asscher cut). See below how they compare side-by-side on a ring and finger.

8.5ct Amethyst (asscher cut)
vs
 8.5ct Tanzanite (asscher cut)
violet
 
blue
12.48×12.48 mm 11.54×11.54 mm
actual size
Actual size of 8.5ct Amethyst (asscher cut, 12.48×12.48mm, Violet color)   Actual size of 8.5ct Tanzanite (asscher cut, 11.54×11.54mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Violet 8.5ct Amethyst (asscher cut, 12.48×12.48mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 8.5ct Tanzanite (asscher cut, 11.54×11.54mm) 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
 74% vs 69%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 8.5ct Amethyst Asscher (12.48×12.48mm, Violet) and 8.5ct Tanzanite Asscher (11.54×11.54mm, 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.


8.5 Ct Amethyst (Asscher) 8.5 Ct Tanzanite (Asscher)
12.48×12.48 mm vs 11.54×11.54 mm
143.29 mm²   122.52 mm²
Face-up size outline for 8.5ct Amethyst (12.48×12.48mm, asscher cut)
Face-up size outline for 8.5ct Tanzanite (11.54×11.54mm, asscher cut)
8.5ct Amethyst Asscher (12.48×12.48mm)
8.5ct Tanzanite Asscher (11.54×11.54mm)
Difference: 17% (20.77 mm²)
8.5ct Amethyst (Asscher, 12.48×12.48mm) has approx. 17% more face-up area than 8.5ct Tanzanite (Asscher, 11.54×11.54mm).


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