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26ct Tanzanite (Round, 18.79×18.79mm, Blue) vs 26ct Aquamarine (Round, 20.14×20.14mm, Light Blue)


Quick summary: When looked from above (face-up position), 26ct Aquamarine (20.14×20.14mm, round cut) appears 15% larger than 26ct Tanzanite (18.79×18.79mm, round cut). See below how they compare side-by-side on a ring and finger.

26ct Tanzanite (round cut)
vs
 26ct Aquamarine (round cut)
blue
 
light blue
18.79×18.79 mm 20.14×20.14 mm
actual size
Actual size of 26ct Tanzanite (round cut, 18.79×18.79mm, Blue color)   Actual size of 26ct Aquamarine (round cut, 20.14×20.14mm, 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 26ct Tanzanite (round cut, 18.79×18.79mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Light Blue 26ct Aquamarine (round cut, 20.14×20.14mm) 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
 112% vs 120%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 26ct Tanzanite Round (18.79×18.79mm, Blue) and 26ct Aquamarine Round (20.14×20.14mm, 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.


26 Ct Tanzanite (Round) 26 Ct Aquamarine (Round)
18.79×18.79 mm vs 20.14×20.14 mm
277.3 mm²   318.57 mm²
Face-up size outline for 26ct Aquamarine (20.14×20.14mm, round cut)
Face-up size outline for 26ct Tanzanite (18.79×18.79mm, round cut)
26ct Tanzanite Round (18.79×18.79mm)
26ct Aquamarine Round (20.14×20.14mm)
Difference: 15% (41.27 mm²)
26ct Aquamarine (Round, 20.14×20.14mm) has approx. 15% more face-up area than 26ct Tanzanite (Round, 18.79×18.79mm).


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