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8ct Amethyst (Round, 13.72×13.72mm, Violet) vs 1ct Diamond (Round, 6.5×6.5mm, White)


Quick summary: When looked from above (face-up position), 8ct Amethyst (13.72×13.72mm, round cut) appears 4.5 times larger than 1ct Diamond (6.5×6.5mm, round cut). See below how they compare side-by-side on a ring and finger.

8ct Amethyst (round cut)
vs
 1ct Diamond (round cut)
violet
 
white
13.72×13.72 mm 6.5×6.5 mm
actual size
Actual size of 8ct Amethyst (round cut, 13.72×13.72mm, Violet color)   Actual size of 1ct Diamond (round cut, 6.5×6.5mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Violet 8ct Amethyst (round cut, 13.72×13.72mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 1ct Diamond (round cut, 6.5×6.5mm) 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
 82% vs 39%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 8ct Amethyst Round (13.72×13.72mm, Violet) and 1ct Diamond Round (6.5×6.5mm, White) 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, Diamond will face-up smaller than Amethyst for a given carat weight, because it has higher specific gravity (3.52 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 Amethyst (Round) 1 Ct Diamond (Round)
13.72×13.72 mm vs 6.5×6.5 mm
147.84 mm²   33.18 mm²
Face-up size outline for 8ct Amethyst (13.72×13.72mm, round cut)
Face-up size outline for 1ct Diamond (6.5×6.5mm, round cut)
8ct Amethyst Round (13.72×13.72mm)
1ct Diamond Round (6.5×6.5mm)
Difference: 346% (114.66 mm²)
8ct Amethyst (Round, 13.72×13.72mm) has approx. 346% more face-up area than 1ct Diamond (Round, 6.5×6.5mm). In other words, it's 4.46x larger.


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