Carat vs. Color  Length*  Width*

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

0.3 Ct Amethyst (Cushion)

versus image

1 Ct Quartz (Round)

Yellowish Green
4.29×4.29 mm 6.86×6.86 mm
Actual size of 0.3ct Amethyst
Actual size of 1ct Quartz

x Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Purple 0.3ct 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 0.3ct Amethyst Cushion (4.29×4.29mm, 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.

0.3 Ct Amethyst (Cushion) 1 Ct Quartz (Round)
4.29×4.29 mm → 16.56 mm² vs. 36.96 mm² ← 6.86×6.86 mm
Face-up size outline
Face-up size outline
0.3ct Amethyst Cushion (4.29×4.29mm)
1ct Quartz Round (6.86×6.86mm)
Difference: 123% (20.4 mm²)
1ct Quartz Round (6.86×6.86mm) has approx. 123% more face-up area than 0.3ct Amethyst Cushion (4.29×4.29mm).

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