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0.17ct Diamond (Round, 3.6×3.6mm, White) vs 0.66ct Tanzanite (Round, 5.55×5.55mm, Blue)


Quick summary: When looked from above (face-up position), 0.66ct Tanzanite (5.55×5.55mm, round cut) appears 2.4 times larger than 0.17ct Diamond (3.6×3.6mm, round cut). See below how they compare side-by-side on a ring and finger.

0.17ct Diamond (round cut)
vs
 0.66ct Tanzanite (round cut)
white
 
blue
3.6×3.6 mm 5.55×5.55 mm
actual size
Actual size of 0.17ct Diamond (round cut, 3.6×3.6mm, White color)   Actual size of 0.66ct Tanzanite (round cut, 5.55×5.55mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 0.17ct Diamond (round cut, 3.6×3.6mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 0.66ct Tanzanite (round cut, 5.55×5.55mm) 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
 22% vs 33%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 0.17ct Diamond Round (3.6×3.6mm, White) and 0.66ct Tanzanite Round (5.55×5.55mm, 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.


0.17 Ct Diamond (Round) 0.66 Ct Tanzanite (Round)
3.6×3.6 mm vs 5.55×5.55 mm
10.18 mm²   24.19 mm²
Face-up size outline for 0.66ct Tanzanite (5.55×5.55mm, round cut)
Face-up size outline for 0.17ct Diamond (3.6×3.6mm, round cut)
0.17ct Diamond Round (3.6×3.6mm)
0.66ct Tanzanite Round (5.55×5.55mm)
Difference: 138% (14.01 mm²)
0.66ct Tanzanite (Round, 5.55×5.55mm) has approx. 138% more face-up area than 0.17ct Diamond (Round, 3.6×3.6mm). In other words, it's 2.38x larger.


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