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8ct Diamond (Pear, 18.09×10.9mm, White) vs 9ct Tourmaline (Cushion, 12.66×12.66mm, Violet)


Quick summary: When looked from above (face-up position), 9ct Tourmaline (12.66×12.66mm, cushion cut) appears 0.2% larger than 8ct Diamond (18.09×10.9mm, pear cut). See below how they compare side-by-side on a ring and finger.

8ct Diamond (pear cut)
vs
 9ct Tourmaline (cushion cut)
white
 
violet
18.09×10.9 mm 12.66×12.66 mm
actual size
Actual size of 8ct Diamond (pear cut, 18.09×10.9mm, White color)   Actual size of 9ct Tourmaline (cushion cut, 12.66×12.66mm, Violet color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 8ct Diamond (pear cut, 18.09×10.9mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Violet 9ct Tourmaline (cushion cut, 12.66×12.66mm) 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
 65% vs 75%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 8ct Diamond Pear (18.09×10.9mm, White) and 9ct Tourmaline Cushion (12.66×12.66mm, 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, Diamond will face-up smaller than Tourmaline for a given carat weight, because it has higher specific gravity (3.52 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.


8 Ct Diamond (Pear) 9 Ct Tourmaline (Cushion)
18.09×10.9 mm vs 12.66×12.66 mm
143.94 mm²   144.25 mm²
Face-up size outline for 9ct Tourmaline (12.66×12.66mm, cushion cut)
Face-up size outline for 8ct Diamond (18.09×10.9mm, pear cut)
8ct Diamond Pear (18.09×10.9mm)
9ct Tourmaline Cushion (12.66×12.66mm)
Difference: 0.2% (0.31 mm²)
9ct Tourmaline (Cushion, 12.66×12.66mm) has approx. 0.2% more face-up area than 8ct Diamond (Pear, 18.09×10.9mm).


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