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1.25ct Tanzanite (Emerald, 7.3×5.41mm, Blue) vs 1.25ct Topaz (Emerald, 7.17×5.31mm, Blue)


Quick summary: When looked from above (face-up position), 1.25ct Tanzanite (7.3×5.41mm, emerald cut) appears 4% larger than 1.25ct Topaz (7.17×5.31mm, emerald cut). See below how they compare side-by-side on a ring and finger.

1.25ct Tanzanite (emerald cut)
vs
 1.25ct Topaz (emerald cut)
blue
 
blue
7.3×5.41 mm 7.17×5.31 mm
actual size
Actual size of 1.25ct Tanzanite (emerald cut, 7.3×5.41mm, Blue color)   Actual size of 1.25ct Topaz (emerald cut, 7.17×5.31mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 1.25ct Tanzanite (emerald cut, 7.3×5.41mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 1.25ct Topaz (emerald cut, 7.17×5.31mm) 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
 33% vs 32%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 1.25ct Tanzanite Emerald (7.3×5.41mm, Blue) and 1.25ct Topaz Emerald (7.17×5.31mm, 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.


1.25 Ct Tanzanite (Emerald) 1.25 Ct Topaz (Emerald)
7.3×5.41 mm vs 7.17×5.31 mm
36.73 mm²   35.41 mm²
Face-up size outline for 1.25ct Tanzanite (7.3×5.41mm, emerald cut)
Face-up size outline for 1.25ct Topaz (7.17×5.31mm, emerald cut)
1.25ct Tanzanite Emerald (7.3×5.41mm)
1.25ct Topaz Emerald (7.17×5.31mm)
Difference: 4% (1.32 mm²)
1.25ct Tanzanite (Emerald, 7.3×5.41mm) has approx. 4% more face-up area than 1.25ct Topaz (Emerald, 7.17×5.31mm).


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