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14ct Amethyst (Cabochon, 18.92×12.61mm, Violet) vs 14ct Diamond (Cabochon, 17.21×11.47mm, White)


Quick summary: When looked from above (face-up position), 14ct Amethyst (18.92×12.61mm, cabochon cut) appears 21% larger than 14ct Diamond (17.21×11.47mm, cabochon cut). See below how they compare side-by-side on a ring and finger.

14ct Amethyst (cabochon cut)
vs
 14ct Diamond (cabochon cut)
violet
 
white
18.92×12.61 mm 17.21×11.47 mm
actual size
Actual size of 14ct Amethyst (cabochon cut, 18.92×12.61mm, Violet color)   Actual size of 14ct Diamond (cabochon cut, 17.21×11.47mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Violet 14ct Amethyst (cabochon cut, 18.92×12.61mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 14ct Diamond (cabochon cut, 17.21×11.47mm) 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
 75% vs 68%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 14ct Amethyst Cabochon (18.92×12.61mm, Violet) and 14ct Diamond Cabochon (17.21×11.47mm, 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.


14 Ct Amethyst (Cabochon) 14 Ct Diamond (Cabochon)
18.92×12.61 mm vs 17.21×11.47 mm
195.64 mm²   161.87 mm²
Face-up size outline for 14ct Amethyst (18.92×12.61mm, cabochon cut)
Face-up size outline for 14ct Diamond (17.21×11.47mm, cabochon cut)
14ct Amethyst Cabochon (18.92×12.61mm)
14ct Diamond Cabochon (17.21×11.47mm)
Difference: 21% (33.77 mm²)
14ct Amethyst (Cabochon, 18.92×12.61mm) has approx. 21% more face-up area than 14ct Diamond (Cabochon, 17.21×11.47mm).


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