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5ct Spinel (Round, 10.59×10.59mm, Red) vs 6.6ct Tourmaline (Round, 12.21×12.21mm, Violet)


Quick summary: When looked from above (face-up position), 6.6ct Tourmaline (12.21×12.21mm, round cut) appears 33% larger than 5ct Spinel (10.59×10.59mm, round cut). See below how they compare side-by-side on a ring and finger.

5ct Spinel (round cut)
vs
 6.6ct Tourmaline (round cut)
red
 
violet
10.59×10.59 mm 12.21×12.21 mm
actual size
Actual size of 5ct Spinel (round cut, 10.59×10.59mm, Red color)   Actual size of 6.6ct Tourmaline (round cut, 12.21×12.21mm, Violet color)
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Red 5ct Spinel (round cut, 10.59×10.59mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Violet 6.6ct Tourmaline (round cut, 12.21×12.21mm) 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
 63% vs 73%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 5ct Spinel Round (10.59×10.59mm, Red) and 6.6ct Tourmaline Round (12.21×12.21mm, 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, Spinel will face-up smaller than Tourmaline for a given carat weight, because it has higher specific gravity (3.6 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.


5 Ct Spinel (Round) 6.6 Ct Tourmaline (Round)
10.59×10.59 mm vs 12.21×12.21 mm
88.08 mm²   117.09 mm²
Face-up size outline for 6.6ct Tourmaline (12.21×12.21mm, round cut)
Face-up size outline for 5ct Spinel (10.59×10.59mm, round cut)
5ct Spinel Round (10.59×10.59mm)
6.6ct Tourmaline Round (12.21×12.21mm)
Difference: 33% (29.01 mm²)
6.6ct Tourmaline (Round, 12.21×12.21mm) has approx. 33% more face-up area than 5ct Spinel (Round, 10.59×10.59mm).


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