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20ct Topaz (Emerald, 18.08×13.39mm, Blue) vs 0.13ct Aquamarine (Round, 3.45×3.45mm, Light Blue)


Quick summary: When looked from above (face-up position), 20ct Topaz (18.08×13.39mm, emerald cut) appears 24.1 times larger than 0.13ct Aquamarine (3.45×3.45mm, round cut). See below how they compare side-by-side on a ring and finger.

20ct Topaz (emerald cut)
vs
 0.13ct Aquamarine (round cut)
blue
 
light blue
18.08×13.39 mm 3.45×3.45 mm
actual size
Actual size of 20ct Topaz (emerald cut, 18.08×13.39mm, Blue color)   Actual size of 0.13ct Aquamarine (round cut, 3.45×3.45mm, 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 Topaz (emerald cut, 18.08×13.39mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Light Blue 0.13ct Aquamarine (round cut, 3.45×3.45mm) 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 21%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 20ct Topaz Emerald (18.08×13.39mm, Blue) and 0.13ct Aquamarine Round (3.45×3.45mm, 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, Topaz will face-up smaller than Aquamarine for a given carat weight, because it has higher specific gravity (3.53 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 Topaz (Emerald) 0.13 Ct Aquamarine (Round)
18.08×13.39 mm vs 3.45×3.45 mm
225.14 mm²   9.35 mm²
Face-up size outline for 20ct Topaz (18.08×13.39mm, emerald cut)
Face-up size outline for 0.13ct Aquamarine (3.45×3.45mm, round cut)
20ct Topaz Emerald (18.08×13.39mm)
0.13ct Aquamarine Round (3.45×3.45mm)
Difference: 2308% (215.79 mm²)
20ct Topaz (Emerald, 18.08×13.39mm) has approx. 2308% more face-up area than 0.13ct Aquamarine (Round, 3.45×3.45mm). In other words, it's 24.08x larger.


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