Carat vs. Color  Length*  Width*

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

1 Ct Tanzanite (Round)

versus image

1 Ct Emerald (Emerald)

6.37×6.37 mm 7.28×5.39 mm
Actual size of 1ct Tanzanite
Actual size of 1ct Emerald

x Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 1ct Tanzanite on a ring
64 mm
Right finger image
Ring on a right finger
Green 1ct Emerald 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 Tanzanite Round (6.37×6.37mm, 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, Tanzanite will face-up smaller than Emerald for a given carat weight, because it has higher specific gravity (3.3 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 Ct Tanzanite (Round) 1 Ct Emerald (Emerald)
6.37×6.37 mm → 31.87 mm² vs. 36.49 mm² ← 7.28×5.39 mm
Face-up size outline
Face-up size outline
1ct Tanzanite Round (6.37×6.37mm)
1ct Emerald Emerald (7.28×5.39mm)
Difference: 14% (4.62 mm²)
1ct Emerald Emerald (7.28×5.39mm) has approx. 14% more face-up area than 1ct Tanzanite Round (6.37×6.37mm).

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