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40ct Tanzanite (Round, 21.69×21.69mm, Blue) vs 40ct Aquamarine (Round, 23.25×23.25mm, Light Blue)


Quick summary: When looked from above (face-up position), 40ct Aquamarine (23.25×23.25mm, round cut) appears 15% larger than 40ct Tanzanite (21.69×21.69mm, round cut). See below how they compare side-by-side on a ring and finger.

40ct Tanzanite (round cut)
vs
 40ct Aquamarine (round cut)
blue
 
light blue
21.69×21.69 mm 23.25×23.25 mm
actual size
Actual size of 40ct Tanzanite (round cut, 21.69×21.69mm, Blue color)   Actual size of 40ct Aquamarine (round cut, 23.25×23.25mm, 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 40ct Tanzanite (round cut, 21.69×21.69mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Light Blue 40ct Aquamarine (round cut, 23.25×23.25mm) 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
 129% vs 138%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 40ct Tanzanite Round (21.69×21.69mm, Blue) and 40ct Aquamarine Round (23.25×23.25mm, 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.


40 Ct Tanzanite (Round) 40 Ct Aquamarine (Round)
21.69×21.69 mm vs 23.25×23.25 mm
369.5 mm²   424.56 mm²
Face-up size outline for 40ct Aquamarine (23.25×23.25mm, round cut)
Face-up size outline for 40ct Tanzanite (21.69×21.69mm, round cut)
40ct Tanzanite Round (21.69×21.69mm)
40ct Aquamarine Round (23.25×23.25mm)
Difference: 15% (55.06 mm²)
40ct Aquamarine (Round, 23.25×23.25mm) has approx. 15% more face-up area than 40ct Tanzanite (Round, 21.69×21.69mm).


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