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0.8ct Tanzanite (Oval, 7.49×4.99mm, Blue) vs 3.5ct Topaz (Emerald, 10.11×7.49mm, Blue)


Quick summary: When looked from above (face-up position), 3.5ct Topaz (10.11×7.49mm, emerald cut) appears 2.3 times larger than 0.8ct Tanzanite (7.49×4.99mm, oval cut). See below how they compare side-by-side on a ring and finger.

0.8ct Tanzanite (oval cut)
vs
 3.5ct Topaz (emerald cut)
blue
 
blue
7.49×4.99 mm 10.11×7.49 mm
actual size
Actual size of 0.8ct Tanzanite (oval cut, 7.49×4.99mm, Blue color)   Actual size of 3.5ct Topaz (emerald cut, 10.11×7.49mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 0.8ct Tanzanite (oval cut, 7.49×4.99mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 3.5ct Topaz (emerald cut, 10.11×7.49mm) 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 45%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 0.8ct Tanzanite Oval (7.49×4.99mm, Blue) and 3.5ct Topaz Emerald (10.11×7.49mm, 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.


0.8 Ct Tanzanite (Oval) 3.5 Ct Topaz (Emerald)
7.49×4.99 mm vs 10.11×7.49 mm
30.65 mm²   70.42 mm²
Face-up size outline for 3.5ct Topaz (10.11×7.49mm, emerald cut)
Face-up size outline for 0.8ct Tanzanite (7.49×4.99mm, oval cut)
0.8ct Tanzanite Oval (7.49×4.99mm)
3.5ct Topaz Emerald (10.11×7.49mm)
Difference: 130% (39.77 mm²)
3.5ct Topaz (Emerald, 10.11×7.49mm) has approx. 130% more face-up area than 0.8ct Tanzanite (Oval, 7.49×4.99mm). In other words, it's 2.3x larger.


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