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0.5ct Topaz (Pear, 6.87×4.14mm, Blue) vs 0.05ct Amethyst (Round, 2.53×2.53mm, Purple)


Quick summary: When looked from above (face-up position), 0.5ct Topaz (6.87×4.14mm, pear cut) appears 4.1 times larger than 0.05ct Amethyst (2.53×2.53mm, round cut). See below how they compare side-by-side on a ring and finger.

0.5ct Topaz (pear cut)
vs
 0.05ct Amethyst (round cut)
blue
 
purple
6.87×4.14 mm 2.53×2.53 mm
actual size
Actual size of 0.5ct Topaz (pear cut, 6.87×4.14mm, Blue color)   Actual size of 0.05ct Amethyst (round cut, 2.53×2.53mm, Purple color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 0.5ct Topaz (pear cut, 6.87×4.14mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Purple 0.05ct Amethyst (round cut, 2.53×2.53mm) 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
 25% vs 15%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 0.5ct Topaz Pear (6.87×4.14mm, Blue) and 0.05ct Amethyst Round (2.53×2.53mm, Purple) 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.


0.5 Ct Topaz (Pear) 0.05 Ct Amethyst (Round)
6.87×4.14 mm vs 2.53×2.53 mm
20.76 mm²   5.03 mm²
Face-up size outline for 0.5ct Topaz (6.87×4.14mm, pear cut)
Face-up size outline for 0.05ct Amethyst (2.53×2.53mm, round cut)
0.5ct Topaz Pear (6.87×4.14mm)
0.05ct Amethyst Round (2.53×2.53mm)
Difference: 313% (15.73 mm²)
0.5ct Topaz (Pear, 6.87×4.14mm) has approx. 313% more face-up area than 0.05ct Amethyst (Round, 2.53×2.53mm). In other words, it's 4.13x larger.


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