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8ct Topaz (Emerald, 13.31×9.86mm, Blue) vs 6.8ct Amethyst (Emerald, 13.88×10.28mm, Violet)


Quick summary: When looked from above (face-up position), 6.8ct Amethyst (13.88×10.28mm, emerald cut) appears 9% larger than 8ct Topaz (13.31×9.86mm, emerald cut). See below how they compare side-by-side on a ring and finger.

8ct Topaz (emerald cut)
vs
 6.8ct Amethyst (emerald cut)
blue
 
violet
13.31×9.86 mm 13.88×10.28 mm
actual size
Actual size of 8ct Topaz (emerald cut, 13.31×9.86mm, Blue color)   Actual size of 6.8ct Amethyst (emerald cut, 13.88×10.28mm, Violet color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 8ct Topaz (emerald cut, 13.31×9.86mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Violet 6.8ct Amethyst (emerald cut, 13.88×10.28mm) 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
 59% vs 61%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 8ct Topaz Emerald (13.31×9.86mm, Blue) and 6.8ct Amethyst Emerald (13.88×10.28mm, 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, 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.


8 Ct Topaz (Emerald) 6.8 Ct Amethyst (Emerald)
13.31×9.86 mm vs 13.88×10.28 mm
122.05 mm²   132.7 mm²
Face-up size outline for 6.8ct Amethyst (13.88×10.28mm, emerald cut)
Face-up size outline for 8ct Topaz (13.31×9.86mm, emerald cut)
8ct Topaz Emerald (13.31×9.86mm)
6.8ct Amethyst Emerald (13.88×10.28mm)
Difference: 9% (10.65 mm²)
6.8ct Amethyst (Emerald, 13.88×10.28mm) has approx. 9% more face-up area than 8ct Topaz (Emerald, 13.31×9.86mm).


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