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8ct Diamond (Cabochon, 14.28×9.52mm, 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 29% larger than 8ct Diamond (14.28×9.52mm, cabochon cut). See below how they compare side-by-side on a ring and finger.

8ct Diamond (cabochon cut)
vs
 9ct Tourmaline (cushion cut)
white
 
violet
14.28×9.52 mm 12.66×12.66 mm
actual size
Actual size of 8ct Diamond (cabochon cut, 14.28×9.52mm, 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 (cabochon cut, 14.28×9.52mm) 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
 57% vs 75%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 8ct Diamond Cabochon (14.28×9.52mm, 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 (Cabochon) 9 Ct Tourmaline (Cushion)
14.28×9.52 mm vs 12.66×12.66 mm
111.48 mm²   144.25 mm²
Face-up size outline for 9ct Tourmaline (12.66×12.66mm, cushion cut)
Face-up size outline for 8ct Diamond (14.28×9.52mm, cabochon cut)
8ct Diamond Cabochon (14.28×9.52mm)
9ct Tourmaline Cushion (12.66×12.66mm)
Difference: 29% (32.77 mm²)
9ct Tourmaline (Cushion, 12.66×12.66mm) has approx. 29% more face-up area than 8ct Diamond (Cabochon, 14.28×9.52mm).


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