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9ct Amethyst (Oval, 18.05×12.03mm, Violet) vs 10.6ct Topaz (Round, 13.69×13.69mm, Blue)


Quick summary: When looked from above (face-up position), 9ct Amethyst (18.05×12.03mm, oval cut) appears 21% larger than 10.6ct Topaz (13.69×13.69mm, round cut). See below how they compare side-by-side on a ring and finger.

9ct Amethyst (oval cut)
vs
 10.6ct Topaz (round cut)
violet
 
blue
18.05×12.03 mm 13.69×13.69 mm
actual size
Actual size of 9ct Amethyst (oval cut, 18.05×12.03mm, Violet color)   Actual size of 10.6ct Topaz (round cut, 13.69×13.69mm, 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 (oval cut, 18.05×12.03mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 10.6ct Topaz (round cut, 13.69×13.69mm) 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
 72% vs 82%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 9ct Amethyst Oval (18.05×12.03mm, Violet) and 10.6ct Topaz Round (13.69×13.69mm, 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 Amethyst for a given carat weight, because it has higher specific gravity (3.53 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 (Oval) 10.6 Ct Topaz (Round)
18.05×12.03 mm vs 13.69×13.69 mm
178.06 mm²   147.2 mm²
Face-up size outline for 9ct Amethyst (18.05×12.03mm, oval cut)
Face-up size outline for 10.6ct Topaz (13.69×13.69mm, round cut)
9ct Amethyst Oval (18.05×12.03mm)
10.6ct Topaz Round (13.69×13.69mm)
Difference: 21% (30.86 mm²)
9ct Amethyst (Oval, 18.05×12.03mm) has approx. 21% more face-up area than 10.6ct Topaz (Round, 13.69×13.69mm).


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