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0.75ct Tanzanite (Cabochon, 6.6×4.4mm, Blue) vs 0.75ct Topaz (Cabochon, 6.48×4.32mm, Blue)


Quick summary: When looked from above (face-up position), 0.75ct Tanzanite (6.6×4.4mm, cabochon cut) appears 4% larger than 0.75ct Topaz (6.48×4.32mm, cabochon cut). See below how they compare side-by-side on a ring and finger.

0.75ct Tanzanite (cabochon cut)
vs
 0.75ct Topaz (cabochon cut)
blue
 
blue
6.6×4.4 mm 6.48×4.32 mm
actual size
Actual size of 0.75ct Tanzanite (cabochon cut, 6.6×4.4mm, Blue color)   Actual size of 0.75ct Topaz (cabochon cut, 6.48×4.32mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 0.75ct Tanzanite (cabochon cut, 6.6×4.4mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 0.75ct Topaz (cabochon cut, 6.48×4.32mm) 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
 27% vs 26%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 0.75ct Tanzanite Cabochon (6.6×4.4mm, Blue) and 0.75ct Topaz Cabochon (6.48×4.32mm, 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.


0.75 Ct Tanzanite (Cabochon) 0.75 Ct Topaz (Cabochon)
6.6×4.4 mm vs 6.48×4.32 mm
23.81 mm²   22.95 mm²
Face-up size outline for 0.75ct Tanzanite (6.6×4.4mm, cabochon cut)
Face-up size outline for 0.75ct Topaz (6.48×4.32mm, cabochon cut)
0.75ct Tanzanite Cabochon (6.6×4.4mm)
0.75ct Topaz Cabochon (6.48×4.32mm)
Difference: 4% (0.86 mm²)
0.75ct Tanzanite (Cabochon, 6.6×4.4mm) has approx. 4% more face-up area than 0.75ct Topaz (Cabochon, 6.48×4.32mm).


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