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1 Ct Tourmaline (Round)

vs

1 Ct Diamond (Round)

bluish green
 
white
6.51×6.51 mm 6.5×6.5 mm
actual size
Actual size of 1ct Tourmaline   Actual size of 1ct Diamond
 
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Ring: Skin tone:
Ring width: 3.0 mm
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Left finger image
Ring on left finger
Bluish Green 1ct Tourmaline on a ring
64 mm
Right finger image
Ring on a right finger
White 1ct Diamond on a ring
Your settings
Ring
Gold
Skin tone
Light
Ring diameter
16.9 mm
Ring width
3.0 mm
Finger length
64 mm
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Ring diameter: 16.9 mm
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Actual sizes of 1ct Tourmaline Round (6.51×6.51mm, Bluish Green) and 1ct Diamond Round (6.5×6.5mm, White) 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?

JamesAllen → high-quality Diamonds, high-end jewelry and competitive prices. Highly recommended.
Amazon → usually offers a good selection from many different vendors. Worth a check.

Face-up Size

All things being equal, Diamond will face-up smaller than Tourmaline for a given carat weight, because it has higher specific gravity (3.52 vs. 3.1 - this means it's "heavier" compared to Tourmaline 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 Tourmaline (Round) 1 Ct Diamond (Round)
6.51×6.51 mm vs 6.5×6.5 mm
33.29 mm²   33.18 mm²
Face-up size outline
Face-up size outline
1ct Tourmaline Round (6.51×6.51mm)
1ct Diamond Round (6.5×6.5mm)
Difference: 0.3% (0.11 mm²)
1ct Tourmaline Round (6.51×6.51mm) has approx. 0.3% more face-up area than 1ct Diamond Round (6.5×6.5mm).


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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.