carat vs. color  length*  width*

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

1 Ct Aquamarine (Oval)


1 Ct Amethyst (Pear)

light blue
8.63×5.75 mm 9.53×5.74 mm
actual size
Actual size of 1ct Aquamarine   Actual size of 1ct Amethyst
Actual size is set for screen Change
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Light Blue 1ct Aquamarine on a ring
64 mm
Right finger image
Ring on a right finger
Violet 1ct 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 Aquamarine Oval (8.63×5.75mm, Light Blue) and 1ct Amethyst Pear (9.53×5.74mm, 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 Aquamarine 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

All things being equal, Aquamarine will face-up slightly smaller than Amethyst for a given carat weight, because it has higher specific gravity (2.7 vs. 2.65 - this means it's "slightly 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.

1 Ct Aquamarine (Oval) 1 Ct Amethyst (Pear)
8.63×5.75 mm vs 9.53×5.74 mm
40.69 mm²   39.93 mm²
Face-up size outline
Face-up size outline
1ct Aquamarine Oval (8.63×5.75mm)
1ct Amethyst Pear (9.53×5.74mm)
Difference: 2% (0.76 mm²)
1ct Aquamarine Oval (8.63×5.75mm) has approx. 2% more face-up area than 1ct Amethyst Pear (9.53×5.74mm).

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.