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12ct Tanzanite (Princess, 12.76×12.76mm, Blue) vs 12ct Aquamarine (Princess, 13.68×13.68mm, Light Blue)


Quick summary: When looked from above (face-up position), 12ct Aquamarine (13.68×13.68mm, princess cut) appears 15% larger than 12ct Tanzanite (12.76×12.76mm, princess cut). See below how they compare side-by-side on a ring and finger.

12ct Tanzanite (princess cut)
vs
 12ct Aquamarine (princess cut)
blue
 
light blue
12.76×12.76 mm 13.68×13.68 mm
actual size
Actual size of 12ct Tanzanite (princess cut, 12.76×12.76mm, Blue color)   Actual size of 12ct Aquamarine (princess cut, 13.68×13.68mm, Light Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 12ct Tanzanite (princess cut, 12.76×12.76mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Light Blue 12ct Aquamarine (princess cut, 13.68×13.68mm) on a right ring and finger
Your settings
Ring
 Gold
Skin tone
 Light
Ring diameter
 16.9 mm
Ring width
 3.0 mm
Finger length
 64 mm
Finger coverage
 76% vs 81%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 12ct Tanzanite Princess (12.76×12.76mm, Blue) and 12ct Aquamarine Princess (13.68×13.68mm, Light 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 certified gemstones, high-end gemstone jewelry, and birthstone jewelry, see Blue Nile

Face-up Size

All things being equal, Tanzanite will face-up smaller than Aquamarine for a given carat weight, because it has higher specific gravity (3.35 vs. 2.72 - this means it's "heavier" compared to Aquamarine 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.


12 Ct Tanzanite (Princess) 12 Ct Aquamarine (Princess)
12.76×12.76 mm vs 13.68×13.68 mm
162.82 mm²   187.14 mm²
Face-up size outline for 12ct Aquamarine (13.68×13.68mm, princess cut)
Face-up size outline for 12ct Tanzanite (12.76×12.76mm, princess cut)
12ct Tanzanite Princess (12.76×12.76mm)
12ct Aquamarine Princess (13.68×13.68mm)
Difference: 15% (24.32 mm²)
12ct Aquamarine (Princess, 13.68×13.68mm) has approx. 15% more face-up area than 12ct Tanzanite (Princess, 12.76×12.76mm).


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