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18ct Tanzanite (Marquise, 27.04×13.52mm, Blue) vs 18ct Aquamarine (Marquise, 28.98×14.49mm, Light Blue)


Quick summary: When looked from above (face-up position), 18ct Aquamarine (28.98×14.49mm, marquise cut) appears 15% larger than 18ct Tanzanite (27.04×13.52mm, marquise cut). See below how they compare side-by-side on a ring and finger.

18ct Tanzanite (marquise cut)
vs
 18ct Aquamarine (marquise cut)
blue
 
light blue
27.04×13.52 mm 28.98×14.49 mm
actual size
Actual size of 18ct Tanzanite (marquise cut, 27.04×13.52mm, Blue color)   Actual size of 18ct Aquamarine (marquise cut, 28.98×14.49mm, 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 18ct Tanzanite (marquise cut, 27.04×13.52mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Light Blue 18ct Aquamarine (marquise cut, 28.98×14.49mm) 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
 80% vs 86%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 18ct Tanzanite Marquise (27.04×13.52mm, Blue) and 18ct Aquamarine Marquise (28.98×14.49mm, 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.


18 Ct Tanzanite (Marquise) 18 Ct Aquamarine (Marquise)
27.04×13.52 mm vs 28.98×14.49 mm
259.56 mm²   298.14 mm²
Face-up size outline for 18ct Aquamarine (28.98×14.49mm, marquise cut)
Face-up size outline for 18ct Tanzanite (27.04×13.52mm, marquise cut)
18ct Tanzanite Marquise (27.04×13.52mm)
18ct Aquamarine Marquise (28.98×14.49mm)
Difference: 15% (38.58 mm²)
18ct Aquamarine (Marquise, 28.98×14.49mm) has approx. 15% more face-up area than 18ct Tanzanite (Marquise, 27.04×13.52mm).


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