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8.5ct Emerald (Cabochon, 15.89×10.59mm, Green) vs 8.5ct Tourmaline (Cabochon, 15.27×10.18mm, Purple)


Quick summary: When looked from above (face-up position), 8.5ct Emerald (15.89×10.59mm, cabochon cut) appears 8% larger than 8.5ct Tourmaline (15.27×10.18mm, cabochon cut). See below how they compare side-by-side on a ring and finger.

8.5ct Emerald (cabochon cut)
vs
 8.5ct Tourmaline (cabochon cut)
green
 
purple
15.89×10.59 mm 15.27×10.18 mm
actual size
Actual size of 8.5ct Emerald (cabochon cut, 15.89×10.59mm, Green color)   Actual size of 8.5ct Tourmaline (cabochon cut, 15.27×10.18mm, Purple color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Green 8.5ct Emerald (cabochon cut, 15.89×10.59mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Purple 8.5ct Tourmaline (cabochon cut, 15.27×10.18mm) 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 61%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 8.5ct Emerald Cabochon (15.89×10.59mm, Green) and 8.5ct Tourmaline Cabochon (15.27×10.18mm, Purple) 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, Tourmaline will face-up smaller than Emerald for a given carat weight, because it has higher specific gravity (3.06 vs. 2.72 - this means it's "heavier" compared to Emerald 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.


8.5 Ct Emerald (Cabochon) 8.5 Ct Tourmaline (Cabochon)
15.89×10.59 mm vs 15.27×10.18 mm
137.99 mm²   127.47 mm²
Face-up size outline for 8.5ct Emerald (15.89×10.59mm, cabochon cut)
Face-up size outline for 8.5ct Tourmaline (15.27×10.18mm, cabochon cut)
8.5ct Emerald Cabochon (15.89×10.59mm)
8.5ct Tourmaline Cabochon (15.27×10.18mm)
Difference: 8% (10.52 mm²)
8.5ct Emerald (Cabochon, 15.89×10.59mm) has approx. 8% more face-up area than 8.5ct Tourmaline (Cabochon, 15.27×10.18mm).


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