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0.55ct Amethyst (Pear, 7.8×4.7mm, Violet) vs 0.25ct Diamond (Round, 4.09×4.09mm, White)


Quick summary: When looked from above (face-up position), 0.55ct Amethyst (7.8×4.7mm, pear cut) appears 2 times larger than 0.25ct Diamond (4.09×4.09mm, round cut). See below how they compare side-by-side on a ring and finger.

0.55ct Amethyst (pear cut)
vs
 0.25ct Diamond (round cut)
violet
 
white
7.8×4.7 mm 4.09×4.09 mm
actual size
Actual size of 0.55ct Amethyst (pear cut, 7.8×4.7mm, Violet color)   Actual size of 0.25ct Diamond (round cut, 4.09×4.09mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Violet 0.55ct Amethyst (pear cut, 7.8×4.7mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 0.25ct Diamond (round cut, 4.09×4.09mm) 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
 28% vs 25%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 0.55ct Amethyst Pear (7.8×4.7mm, Violet) and 0.25ct Diamond Round (4.09×4.09mm, 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.


0.55 Ct Amethyst (Pear) 0.25 Ct Diamond (Round)
7.8×4.7 mm vs 4.09×4.09 mm
26.76 mm²   13.14 mm²
Face-up size outline for 0.55ct Amethyst (7.8×4.7mm, pear cut)
Face-up size outline for 0.25ct Diamond (4.09×4.09mm, round cut)
0.55ct Amethyst Pear (7.8×4.7mm)
0.25ct Diamond Round (4.09×4.09mm)
Difference: 104% (13.62 mm²)
0.55ct Amethyst (Pear, 7.8×4.7mm) has approx. 104% more face-up area than 0.25ct Diamond (Round, 4.09×4.09mm). In other words, it's 2.04x larger.


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