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3ct Aquamarine (Round, 9.83×9.83mm, Light Blue) vs 2.31ct Tanzanite (Round, 8.43×8.43mm, Blue)


Quick summary: When looked from above (face-up position), 3ct Aquamarine (9.83×9.83mm, round cut) appears 36% larger than 2.31ct Tanzanite (8.43×8.43mm, round cut). See below how they compare side-by-side on a ring and finger.

3ct Aquamarine (round cut)
vs
 2.31ct Tanzanite (round cut)
light blue
 
blue
9.83×9.83 mm 8.43×8.43 mm
actual size
Actual size of 3ct Aquamarine (round cut, 9.83×9.83mm, Light Blue color)   Actual size of 2.31ct Tanzanite (round cut, 8.43×8.43mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Light Blue 3ct Aquamarine (round cut, 9.83×9.83mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 2.31ct Tanzanite (round cut, 8.43×8.43mm) 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
 59% vs 50%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 3ct Aquamarine Round (9.83×9.83mm, Light Blue) and 2.31ct Tanzanite Round (8.43×8.43mm, 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.


3 Ct Aquamarine (Round) 2.31 Ct Tanzanite (Round)
9.83×9.83 mm vs 8.43×8.43 mm
75.89 mm²   55.81 mm²
Face-up size outline for 3ct Aquamarine (9.83×9.83mm, round cut)
Face-up size outline for 2.31ct Tanzanite (8.43×8.43mm, round cut)
3ct Aquamarine Round (9.83×9.83mm)
2.31ct Tanzanite Round (8.43×8.43mm)
Difference: 36% (20.08 mm²)
3ct Aquamarine (Round, 9.83×9.83mm) has approx. 36% more face-up area than 2.31ct Tanzanite (Round, 8.43×8.43mm).


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