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8ct Tanzanite (Oval, 16.13×10.75mm, Blue) vs 10ct Diamond (Round, 14×14mm, White)


Quick summary: When looked from above (face-up position), 10ct Diamond (14×14mm, round cut) appears 8% larger than 8ct Tanzanite (16.13×10.75mm, oval cut). See below how they compare side-by-side on a ring and finger.

8ct Tanzanite (oval cut)
vs
 10ct Diamond (round cut)
blue
 
white
16.13×10.75 mm 14×14 mm
actual size
Actual size of 8ct Tanzanite (oval cut, 16.13×10.75mm, Blue color)   Actual size of 10ct Diamond (round cut, 14×14mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 8ct Tanzanite (oval cut, 16.13×10.75mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 10ct Diamond (round cut, 14×14mm) 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
 64% vs 83%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 8ct Tanzanite Oval (16.13×10.75mm, Blue) and 10ct Diamond Round (14×14mm, White) 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.


8 Ct Tanzanite (Oval) 10 Ct Diamond (Round)
16.13×10.75 mm vs 14×14 mm
142.19 mm²   153.94 mm²
Face-up size outline for 10ct Diamond (14×14mm, round cut)
Face-up size outline for 8ct Tanzanite (16.13×10.75mm, oval cut)
8ct Tanzanite Oval (16.13×10.75mm)
10ct Diamond Round (14×14mm)
Difference: 8% (11.75 mm²)
10ct Diamond (Round, 14×14mm) has approx. 8% more face-up area than 8ct Tanzanite (Oval, 16.13×10.75mm).


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