carat vs. color  length*  width*

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

1 Ct Quartz (Round)


11 Ct Amethyst (Emerald)

orangey red
6.86×6.86 mm 16.29×12.07 mm
actual size
Actual size of 1ct Quartz   Actual size of 11ct Amethyst
Actual size is set for screen Change
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Orangey Red 1ct Quartz on a ring
64 mm
Right finger image
Ring on a right finger
Violet 11ct Amethyst 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 Quartz Round (6.86×6.86mm, Orangey Red) and 11ct Amethyst Emerald (16.29×12.07mm, Violet) 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 Quartz or Amethyst check what Amazon has to offer. You'll usually find quite a selection from many different vendors. Worth a check. For other high quality gemstones (Rubies, Saphhires, Emeralds) and especially Diamonds, I highly recommend JamesAllen.

Face-up Size

Quartz and Amethyst 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 Quartz (Round) 11 Ct Amethyst (Emerald)
6.86×6.86 mm vs 16.29×12.07 mm
36.96 mm²   182.86 mm²
Face-up size outline
Face-up size outline
1ct Quartz Round (6.86×6.86mm)
11ct Amethyst Emerald (16.29×12.07mm)
Difference: 395% (145.9 mm²)
11ct Amethyst Emerald (16.29×12.07mm) has approx. 395% more face-up area than 1ct Quartz Round (6.86×6.86mm).

Popular comparisons:

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Actual size is currently adjusted to screen.

If your screen (phone, tablet, or monitor) is not in diagonal, then the actual size of a gem, ring and finger will not be shown correctly.