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20ct Tanzanite (Marquise, 28×14mm, Blue) vs 20ct Aquamarine (Marquise, 30.02×15.01mm, Light Blue)


Quick summary: When looked from above (face-up position), 20ct Aquamarine (30.02×15.01mm, marquise cut) appears 15% larger than 20ct Tanzanite (28×14mm, marquise cut). See below how they compare side-by-side on a ring and finger.

20ct Tanzanite (marquise cut)
vs
 20ct Aquamarine (marquise cut)
blue
 
light blue
28×14 mm 30.02×15.01 mm
actual size
Actual size of 20ct Tanzanite (marquise cut, 28×14mm, Blue color)   Actual size of 20ct Aquamarine (marquise cut, 30.02×15.01mm, 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 20ct Tanzanite (marquise cut, 28×14mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Light Blue 20ct Aquamarine (marquise cut, 30.02×15.01mm) 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
 83% vs 89%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 20ct Tanzanite Marquise (28×14mm, Blue) and 20ct Aquamarine Marquise (30.02×15.01mm, 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.


20 Ct Tanzanite (Marquise) 20 Ct Aquamarine (Marquise)
28×14 mm vs 30.02×15.01 mm
278.32 mm²   319.93 mm²
Face-up size outline for 20ct Aquamarine (30.02×15.01mm, marquise cut)
Face-up size outline for 20ct Tanzanite (28×14mm, marquise cut)
20ct Tanzanite Marquise (28×14mm)
20ct Aquamarine Marquise (30.02×15.01mm)
Difference: 15% (41.61 mm²)
20ct Aquamarine (Marquise, 30.02×15.01mm) has approx. 15% more face-up area than 20ct Tanzanite (Marquise, 28×14mm).


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