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Carat vs. Color  Length*  Width*
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(or examine a single gem)
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1.38 Ct Topaz (Round)

versus image

1 Ct Emerald (Emerald)

Blue
 
Green
6.94×6.94 mm 7.28×5.39 mm
Actual size of 1.38ct Topaz
Actual size of 1ct Emerald

Settings
x Ring: Skin tone:
Ring width: 3.0 mm
Saved...
Left finger image
Ring on left finger
Blue 1.38ct Topaz on a ring
64 mm
Right finger image
Ring on a right finger
Green 1ct Emerald on a ring
Your settings
Ring
Gold
Skin tone
Light
Ring diameter
16.9 mm
Ring width
3.0 mm
Finger length
64 mm
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 1.38ct Topaz Round (6.94×6.94mm, Blue) and 1ct Emerald Emerald (7.28×5.39mm, Green) 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.

Face-up Size

All things being equal, Topaz will face-up smaller than Emerald for a given carat weight, because it has higher specific gravity (3.53 vs. 2.7 - this means it's "heavier" compared to Emerald 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.


1.38 Ct Topaz (Round) 1 Ct Emerald (Emerald)
6.94×6.94 mm → 37.83 mm² vs. 36.49 mm² ← 7.28×5.39 mm
Face-up size outline
Face-up size outline
1.38ct Topaz Round (6.94×6.94mm)
1ct Emerald Emerald (7.28×5.39mm)
Difference: 4% (1.34 mm²)
1.38ct Topaz Round (6.94×6.94mm) has approx. 4% more face-up area than 1ct Emerald Emerald (7.28×5.39mm).


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