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1 Ct Tanzanite (Round)

vs

1 Ct Alexandrite (Round)

dark blue
 
dark bluish green
6.37×6.37 mm 6.14×6.14 mm
actual size
Actual size of 1ct Tanzanite   Actual size of 1ct Alexandrite
 
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Ring: Skin tone:
Ring width: 3.0 mm
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Left finger image
Ring on left finger
Dark Blue 1ct Tanzanite on a ring
64 mm
Right finger image
Ring on a right finger
Dark Bluish Green 1ct Alexandrite 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 Tanzanite Round (6.37×6.37mm, Dark Blue) and 1ct Alexandrite Round (6.14×6.14mm, Dark Bluish 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.

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Face-up Size

All things being equal, Alexandrite will face-up smaller than Tanzanite for a given carat weight, because it has higher specific gravity (3.7 vs. 3.3 - this means it's "heavier" compared to Tanzanite 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 Alexandrite (Round)
6.37×6.37 mm vs 6.14×6.14 mm
31.87 mm²   29.61 mm²
Face-up size outline
Face-up size outline
1ct Tanzanite Round (6.37×6.37mm)
1ct Alexandrite Round (6.14×6.14mm)
Difference: 8% (2.26 mm²)
1ct Tanzanite Round (6.37×6.37mm) has approx. 8% more face-up area than 1ct Alexandrite Round (6.14×6.14mm).


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