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7ct Tourmaline (Trillion, 15.29×15.29mm, Purple) vs 7ct Sapphire (Trillion, 13.98×13.98mm, Blue)


Quick summary: When looked from above (face-up position), 7ct Tourmaline (15.29×15.29mm, trillion cut) appears 20% larger than 7ct Sapphire (13.98×13.98mm, trillion cut). See below how they compare side-by-side on a ring and finger.

7ct Tourmaline (trillion cut)
vs
 7ct Sapphire (trillion cut)
purple
 
blue
15.29×15.29 mm 13.98×13.98 mm
actual size
Actual size of 7ct Tourmaline (trillion cut, 15.29×15.29mm, Purple color)   Actual size of 7ct Sapphire (trillion cut, 13.98×13.98mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Purple 7ct Tourmaline (trillion cut, 15.29×15.29mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 7ct Sapphire (trillion cut, 13.98×13.98mm) 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
 91% vs 83%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 7ct Tourmaline Trillion (15.29×15.29mm, Purple) and 7ct Sapphire Trillion (13.98×13.98mm, Blue) 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, Sapphire will face-up smaller than Tourmaline for a given carat weight, because it has higher specific gravity (4 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.


7 Ct Tourmaline (Trillion) 7 Ct Sapphire (Trillion)
15.29×15.29 mm vs 13.98×13.98 mm
144.95 mm²   121.17 mm²
Face-up size outline for 7ct Tourmaline (15.29×15.29mm, trillion cut)
Face-up size outline for 7ct Sapphire (13.98×13.98mm, trillion cut)
7ct Tourmaline Trillion (15.29×15.29mm)
7ct Sapphire Trillion (13.98×13.98mm)
Difference: 20% (23.78 mm²)
7ct Tourmaline (Trillion, 15.29×15.29mm) has approx. 20% more face-up area than 7ct Sapphire (Trillion, 13.98×13.98mm).


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