×
carat vs. color  length*  width*
  ×

(or examine a )
* size in mm (optional)

1ct Topaz (Emerald, 6.66×4.93mm, White) vs 1ct Tanzanite (Emerald, 6.8×5.04mm, Blue)


Quick summary: When looked from above (face-up position), 1ct Tanzanite (6.8×5.04mm, emerald cut) appears 4% larger than 1ct Topaz (6.66×4.93mm, emerald cut). See below how they compare side-by-side on a ring and finger.

1ct Topaz (emerald cut)
vs
 1ct Tanzanite (emerald cut)
white
 
blue
6.66×4.93 mm 6.8×5.04 mm
actual size
Actual size of 1ct Topaz (emerald cut, 6.66×4.93mm, White color)   Actual size of 1ct Tanzanite (emerald cut, 6.8×5.04mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 1ct Topaz (emerald cut, 6.66×4.93mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 1ct Tanzanite (emerald cut, 6.8×5.04mm) 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
 30% vs 30%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 1ct Topaz Emerald (6.66×4.93mm, White) and 1ct Tanzanite Emerald (6.8×5.04mm, 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 Ct Topaz (Emerald) 1 Ct Tanzanite (Emerald)
6.66×4.93 mm vs 6.8×5.04 mm
30.54 mm²   31.87 mm²
Face-up size outline for 1ct Tanzanite (6.8×5.04mm, emerald cut)
Face-up size outline for 1ct Topaz (6.66×4.93mm, emerald cut)
1ct Topaz Emerald (6.66×4.93mm)
1ct Tanzanite Emerald (6.8×5.04mm)
Difference: 4% (1.33 mm²)
1ct Tanzanite (Emerald, 6.8×5.04mm) has approx. 4% more face-up area than 1ct Topaz (Emerald, 6.66×4.93mm).


Popular comparisons: