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17ct Amethyst (Emerald, 18.83×13.95mm, Violet) vs 2.8ct Peridot (Pear, 12.42×7.48mm, Yellowish Green)


Quick summary: When looked from above (face-up position), 17ct Amethyst (18.83×13.95mm, emerald cut) appears 3.6 times larger than 2.8ct Peridot (12.42×7.48mm, pear cut). See below how they compare side-by-side on a ring and finger.

17ct Amethyst (emerald cut)
vs
 2.8ct Peridot (pear cut)
violet
 
yellowish green
18.83×13.95 mm 12.42×7.48 mm
actual size
Actual size of 17ct Amethyst (emerald cut, 18.83×13.95mm, Violet color)   Actual size of 2.8ct Peridot (pear cut, 12.42×7.48mm, Yellowish Green color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Violet 17ct Amethyst (emerald cut, 18.83×13.95mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Yellowish Green 2.8ct Peridot (pear cut, 12.42×7.48mm) 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
 83% vs 45%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 17ct Amethyst Emerald (18.83×13.95mm, Violet) and 2.8ct Peridot Pear (12.42×7.48mm, Yellowish Green) 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, Peridot will face-up smaller than Amethyst for a given carat weight, because it has higher specific gravity (3.34 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.


17 Ct Amethyst (Emerald) 2.8 Ct Peridot (Pear)
18.83×13.95 mm vs 12.42×7.48 mm
244.29 mm²   67.82 mm²
Face-up size outline for 17ct Amethyst (18.83×13.95mm, emerald cut)
Face-up size outline for 2.8ct Peridot (12.42×7.48mm, pear cut)
17ct Amethyst Emerald (18.83×13.95mm)
2.8ct Peridot Pear (12.42×7.48mm)
Difference: 260% (176.47 mm²)
17ct Amethyst (Emerald, 18.83×13.95mm) has approx. 260% more face-up area than 2.8ct Peridot (Pear, 12.42×7.48mm). In other words, it's 3.6x larger.


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