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3ct Diamond (Trillion, 11.16×11.16mm, White) vs 3ct Amethyst (Baguette, 11.46×7.64mm, Light Purple)


Quick summary: When looked from above (face-up position), 3ct Amethyst (11.46×7.64mm, baguette cut) appears 13% larger than 3ct Diamond (11.16×11.16mm, trillion cut). See below how they compare side-by-side on a ring and finger.

3ct Diamond (trillion cut)
vs
 3ct Amethyst (baguette cut)
white
 
light purple
11.16×11.16 mm 11.46×7.64 mm
actual size
Actual size of 3ct Diamond (trillion cut, 11.16×11.16mm, White color)   Actual size of 3ct Amethyst (baguette cut, 11.46×7.64mm, Light Purple color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 3ct Diamond (trillion cut, 11.16×11.16mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Light Purple 3ct Amethyst (baguette cut, 11.46×7.64mm) 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
 67% vs 46%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 3ct Diamond Trillion (11.16×11.16mm, White) and 3ct Amethyst Baguette (11.46×7.64mm, Light 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, 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.


3 Ct Diamond (Trillion) 3 Ct Amethyst (Baguette)
11.16×11.16 mm vs 11.46×7.64 mm
77.22 mm²   87.55 mm²
Face-up size outline for 3ct Amethyst (11.46×7.64mm, baguette cut)
Face-up size outline for 3ct Diamond (11.16×11.16mm, trillion cut)
3ct Diamond Trillion (11.16×11.16mm)
3ct Amethyst Baguette (11.46×7.64mm)
Difference: 13% (10.33 mm²)
3ct Amethyst (Baguette, 11.46×7.64mm) has approx. 13% more face-up area than 3ct Diamond (Trillion, 11.16×11.16mm).


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