Carat vs. Color  Length*  Width*

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

1 Ct Amethyst (Cushion)

versus image

1 Ct Quartz (Round)

Yellowish Green
6.41×6.41 mm 6.86×6.86 mm
Actual size of 1ct Amethyst
Actual size of 1ct Quartz

x Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Purple 1ct Amethyst on a ring
64 mm
Right finger image
Ring on a right finger
Yellowish Green 1ct Quartz 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 1ct Amethyst Cushion (6.41×6.41mm, Purple) and 1ct Quartz Round (6.86×6.86mm, Yellowish Green) 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

Amethyst and Quartz have the same specific gravity so their face-up size depends on the weight, shape and 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.

1 Ct Amethyst (Cushion) 1 Ct Quartz (Round)
6.41×6.41 mm → 36.98 mm² vs. 36.96 mm² ← 6.86×6.86 mm
Face-up size outline
Face-up size outline
1ct Amethyst Cushion (6.41×6.41mm)
1ct Quartz Round (6.86×6.86mm)
Difference: 0.1% (0.02 mm²)
1ct Amethyst Cushion (6.41×6.41mm) has approx. 0.1% more face-up area than 1ct Quartz Round (6.86×6.86mm).

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