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17ct Tanzanite (Round, 16.31×16.31mm, Blue) vs 17ct Aquamarine (Round, 17.48×17.48mm, Light Blue)


Quick summary: When looked from above (face-up position), 17ct Aquamarine (17.48×17.48mm, round cut) appears 15% larger than 17ct Tanzanite (16.31×16.31mm, round cut). See below how they compare side-by-side on a ring and finger.

17ct Tanzanite (round cut)
vs
 17ct Aquamarine (round cut)
blue
 
light blue
16.31×16.31 mm 17.48×17.48 mm
actual size
Actual size of 17ct Tanzanite (round cut, 16.31×16.31mm, Blue color)   Actual size of 17ct Aquamarine (round cut, 17.48×17.48mm, 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 17ct Tanzanite (round cut, 16.31×16.31mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Light Blue 17ct Aquamarine (round cut, 17.48×17.48mm) 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
 97% vs 104%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 17ct Tanzanite Round (16.31×16.31mm, Blue) and 17ct Aquamarine Round (17.48×17.48mm, 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.


17 Ct Tanzanite (Round) 17 Ct Aquamarine (Round)
16.31×16.31 mm vs 17.48×17.48 mm
208.93 mm²   239.98 mm²
Face-up size outline for 17ct Aquamarine (17.48×17.48mm, round cut)
Face-up size outline for 17ct Tanzanite (16.31×16.31mm, round cut)
17ct Tanzanite Round (16.31×16.31mm)
17ct Aquamarine Round (17.48×17.48mm)
Difference: 15% (31.05 mm²)
17ct Aquamarine (Round, 17.48×17.48mm) has approx. 15% more face-up area than 17ct Tanzanite (Round, 16.31×16.31mm).


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