carat vs. color  length*  width*

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

1 Ct Topaz (Round)


0.5 Ct Topaz (Round)

6×6 mm 5×5 mm
actual size
Actual size of 1ct Topaz   Actual size of 0.5ct Topaz
Actual size is set for screen Change
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 1ct Topaz on a ring
64 mm
Right finger image
Ring on a right finger
Blue 0.5ct Topaz 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 Topaz Round (6×6mm, Blue) and 0.5ct Topaz Round (5×5mm, Blue) 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 Topaz 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 Ct Topaz (Round) 0.5 Ct Topaz (Round)
6×6 mm vs 5×5 mm
28.27 mm²   19.63 mm²
Face-up size outline
Face-up size outline
1ct Topaz Round (6×6mm)
0.5ct Topaz Round (5×5mm)
Difference: 44% (8.64 mm²)
1ct Topaz Round (6×6mm) has approx. 44% more face-up area than 0.5ct Topaz Round (5×5mm).

Popular comparisons:

Enter your screen size (diagonal)

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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.