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1ct Tanzanite (Round, 6.34×6.34mm, Blue) vs 1ct Topaz (Round, 6.23×6.23mm, Blue)


Quick summary: When looked from above (face-up position), 1ct Tanzanite (6.34×6.34mm, round cut) appears 4% larger than 1ct Topaz (6.23×6.23mm, round cut). See below how they compare side-by-side on a ring and finger.

1ct Tanzanite (round cut)
vs
 1ct Topaz (round cut)
blue
 
blue
6.34×6.34 mm 6.23×6.23 mm
actual size
Actual size of 1ct Tanzanite (round cut, 6.34×6.34mm, Blue color)   Actual size of 1ct Topaz (round cut, 6.23×6.23mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 1ct Tanzanite (round cut, 6.34×6.34mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 1ct Topaz (round cut, 6.23×6.23mm) 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
 38% vs 37%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 1ct Tanzanite Round (6.34×6.34mm, Blue) and 1ct Topaz Round (6.23×6.23mm, 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 Tanzanite (Round) 1 Ct Topaz (Round)
6.34×6.34 mm vs 6.23×6.23 mm
31.57 mm²   30.48 mm²
Face-up size outline for 1ct Tanzanite (6.34×6.34mm, round cut)
Face-up size outline for 1ct Topaz (6.23×6.23mm, round cut)
1ct Tanzanite Round (6.34×6.34mm)
1ct Topaz Round (6.23×6.23mm)
Difference: 4% (1.09 mm²)
1ct Tanzanite (Round, 6.34×6.34mm) has approx. 4% more face-up area than 1ct Topaz (Round, 6.23×6.23mm).


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