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3ct Aquamarine (Round, 9.83×9.83mm, Light Bluish Green) vs 0.1ct Amethyst (Trillion, 3.74×3.74mm, Dark Purple)


Quick summary: When looked from above (face-up position), 3ct Aquamarine (9.83×9.83mm, round cut) appears 8.8 times larger than 0.1ct Amethyst (3.74×3.74mm, trillion cut). See below how they compare side-by-side on a ring and finger.

3ct Aquamarine (round cut)
vs
 0.1ct Amethyst (trillion cut)
light bluish green
 
dark purple
9.83×9.83 mm 3.74×3.74 mm
actual size
Actual size of 3ct Aquamarine (round cut, 9.83×9.83mm, Light Bluish Green color)   Actual size of 0.1ct Amethyst (trillion cut, 3.74×3.74mm, Dark Purple color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Light Bluish Green 3ct Aquamarine (round cut, 9.83×9.83mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Dark Purple 0.1ct Amethyst (trillion cut, 3.74×3.74mm) 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
 59% vs 23%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 3ct Aquamarine Round (9.83×9.83mm, Light Bluish Green) and 0.1ct Amethyst Trillion (3.74×3.74mm, Dark 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, Aquamarine will face-up slightly smaller than Amethyst for a given carat weight, because it has higher specific gravity (2.72 vs. 2.65 - this means it's "slightly 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.


3 Ct Aquamarine (Round) 0.1 Ct Amethyst (Trillion)
9.83×9.83 mm vs 3.74×3.74 mm
75.89 mm²   8.67 mm²
Face-up size outline for 3ct Aquamarine (9.83×9.83mm, round cut)
Face-up size outline for 0.1ct Amethyst (3.74×3.74mm, trillion cut)
3ct Aquamarine Round (9.83×9.83mm)
0.1ct Amethyst Trillion (3.74×3.74mm)
Difference: 775% (67.22 mm²)
3ct Aquamarine (Round, 9.83×9.83mm) has approx. 775% more face-up area than 0.1ct Amethyst (Trillion, 3.74×3.74mm). In other words, it's 8.75x larger.


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