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0.34ct Diamond (Round, 4.54×4.54mm, White) vs 20.5ct Tanzanite (Oval, 22.07×14.71mm, Blue)


Quick summary: When looked from above (face-up position), 20.5ct Tanzanite (22.07×14.71mm, oval cut) appears 16.4 times larger than 0.34ct Diamond (4.54×4.54mm, round cut). See below how they compare side-by-side on a ring and finger.

0.34ct Diamond (round cut)
vs
 20.5ct Tanzanite (oval cut)
white
 
blue
4.54×4.54 mm 22.07×14.71 mm
actual size
Actual size of 0.34ct Diamond (round cut, 4.54×4.54mm, White color)   Actual size of 20.5ct Tanzanite (oval cut, 22.07×14.71mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 0.34ct Diamond (round cut, 4.54×4.54mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 20.5ct Tanzanite (oval cut, 22.07×14.71mm) 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 88%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 0.34ct Diamond Round (4.54×4.54mm, White) and 20.5ct Tanzanite Oval (22.07×14.71mm, 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, Diamond will face-up smaller than Tanzanite for a given carat weight, because it has higher specific gravity (3.52 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.


0.34 Ct Diamond (Round) 20.5 Ct Tanzanite (Oval)
4.54×4.54 mm vs 22.07×14.71 mm
16.19 mm²   266.21 mm²
Face-up size outline for 20.5ct Tanzanite (22.07×14.71mm, oval cut)
Face-up size outline for 0.34ct Diamond (4.54×4.54mm, round cut)
0.34ct Diamond Round (4.54×4.54mm)
20.5ct Tanzanite Oval (22.07×14.71mm)
Difference: 1544% (250.02 mm²)
20.5ct Tanzanite (Oval, 22.07×14.71mm) has approx. 1544% more face-up area than 0.34ct Diamond (Round, 4.54×4.54mm). In other words, it's 16.44x larger.


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