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0.7ct Tanzanite (Round, 5.66×5.66mm, Blue) vs 8.33ct Tourmaline (Oval, 16.7×11.13mm, Violet)


Quick summary: When looked from above (face-up position), 8.33ct Tourmaline (16.7×11.13mm, oval cut) appears 6.1 times larger than 0.7ct Tanzanite (5.66×5.66mm, round cut). See below how they compare side-by-side on a ring and finger.

0.7ct Tanzanite (round cut)
vs
 8.33ct Tourmaline (oval cut)
blue
 
violet
5.66×5.66 mm 16.7×11.13 mm
actual size
Actual size of 0.7ct Tanzanite (round cut, 5.66×5.66mm, Blue color)   Actual size of 8.33ct Tourmaline (oval cut, 16.7×11.13mm, Violet color)
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 0.7ct Tanzanite (round cut, 5.66×5.66mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Violet 8.33ct Tourmaline (oval cut, 16.7×11.13mm) 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
 34% vs 66%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 0.7ct Tanzanite Round (5.66×5.66mm, Blue) and 8.33ct Tourmaline Oval (16.7×11.13mm, Violet) 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, Tanzanite will face-up smaller than Tourmaline for a given carat weight, because it has higher specific gravity (3.35 vs. 3.06 - this means it's "heavier" compared to Tourmaline 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.


0.7 Ct Tanzanite (Round) 8.33 Ct Tourmaline (Oval)
5.66×5.66 mm vs 16.7×11.13 mm
25.16 mm²   152.41 mm²
Face-up size outline for 8.33ct Tourmaline (16.7×11.13mm, oval cut)
Face-up size outline for 0.7ct Tanzanite (5.66×5.66mm, round cut)
0.7ct Tanzanite Round (5.66×5.66mm)
8.33ct Tourmaline Oval (16.7×11.13mm)
Difference: 506% (127.25 mm²)
8.33ct Tourmaline (Oval, 16.7×11.13mm) has approx. 506% more face-up area than 0.7ct Tanzanite (Round, 5.66×5.66mm). In other words, it's 6.06x larger.


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