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15ct Topaz (Emerald, 16.42×12.16mm, Blue) vs 0.6ct Tanzanite (Trillion, 6.32×6.32mm, Blue)


Quick summary: When looked from above (face-up position), 15ct Topaz (16.42×12.16mm, emerald cut) appears 7.5 times larger than 0.6ct Tanzanite (6.32×6.32mm, trillion cut). See below how they compare side-by-side on a ring and finger.

15ct Topaz (emerald cut)
vs
 0.6ct Tanzanite (trillion cut)
blue
 
blue
16.42×12.16 mm 6.32×6.32 mm
actual size
Actual size of 15ct Topaz (emerald cut, 16.42×12.16mm, Blue color)   Actual size of 0.6ct Tanzanite (trillion cut, 6.32×6.32mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 15ct Topaz (emerald cut, 16.42×12.16mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 0.6ct Tanzanite (trillion cut, 6.32×6.32mm) 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
 72% vs 38%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 15ct Topaz Emerald (16.42×12.16mm, Blue) and 0.6ct Tanzanite Trillion (6.32×6.32mm, 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 Tanzanite for a given carat weight, because it has higher specific gravity (3.53 vs. 3.35 - this means it's "heavier" compared to Tanzanite 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.


15 Ct Topaz (Emerald) 0.6 Ct Tanzanite (Trillion)
16.42×12.16 mm vs 6.32×6.32 mm
185.69 mm²   24.76 mm²
Face-up size outline for 15ct Topaz (16.42×12.16mm, emerald cut)
Face-up size outline for 0.6ct Tanzanite (6.32×6.32mm, trillion cut)
15ct Topaz Emerald (16.42×12.16mm)
0.6ct Tanzanite Trillion (6.32×6.32mm)
Difference: 650% (160.93 mm²)
15ct Topaz (Emerald, 16.42×12.16mm) has approx. 650% more face-up area than 0.6ct Tanzanite (Trillion, 6.32×6.32mm). In other words, it's 7.5x larger.


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