carat vs. color  length*  width*

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

1.58 Ct Tourmaline (Round)


1.66 Ct Tourmaline (Round)

light red
light red
7.58×7.58 mm 7.71×7.71 mm
actual size
Actual size of 1.58ct Tourmaline   Actual size of 1.66ct Tourmaline
Actual size is set for screen Change
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Light Red 1.58ct Tourmaline on a ring
64 mm
Right finger image
Ring on a right finger
Light Red 1.66ct Tourmaline 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 1.58ct Tourmaline Round (7.58×7.58mm, Light Red) and 1.66ct Tourmaline Round (7.71×7.71mm, Light Red) 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 Tourmaline 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

The face-up size depends on the shape of the gem, its weight and 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.

1.58 Ct Tourmaline (Round) 1.66 Ct Tourmaline (Round)
7.58×7.58 mm vs 7.71×7.71 mm
45.13 mm²   46.69 mm²
Face-up size outline
Face-up size outline
1.58ct Tourmaline Round (7.58×7.58mm)
1.66ct Tourmaline Round (7.71×7.71mm)
Difference: 3% (1.56 mm²)
1.66ct Tourmaline Round (7.71×7.71mm) has approx. 3% more face-up area than 1.58ct Tourmaline Round (7.58×7.58mm).

Popular comparisons:

Enter your screen size (diagonal)

My screen size is  inches

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.