Carat vs. Color  Length*  Width*

(or examine a single gem)
* size in mm (optional)

10.5 Ct Amethyst (Cushion)

versus image

10.5 Ct Diamond (Princess)

14.05×14.05 mm 12.07×12.07 mm
Actual size of 10.5ct Amethyst
Actual size of 10.5ct Diamond

x Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Violet 10.5ct Amethyst on a ring
64 mm
Right finger image
Ring on a right finger
White 10.5ct Diamond on a ring
Your settings
Skin tone
Ring diameter
16.9 mm
Ring width
3.0 mm
Finger length
64 mm
Ring diameter: 16.9 mm
Actual sizes of 10.5ct Amethyst Cushion (14.05×14.05mm, Violet) and 10.5ct Diamond Princess (12.07×12.07mm, 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.

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.

10.5 Ct Amethyst (Cushion) 10.5 Ct Diamond (Princess)
14.05×14.05 mm → 177.66 mm² vs. 145.68 mm² ← 12.07×12.07 mm
Face-up size outline
Face-up size outline
10.5ct Amethyst Cushion (14.05×14.05mm)
10.5ct Diamond Princess (12.07×12.07mm)
Difference: 22% (31.98 mm²)
10.5ct Amethyst Cushion (14.05×14.05mm) has approx. 22% more face-up area than 10.5ct Diamond Princess (12.07×12.07mm).

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