13 Carat Tourmaline (Trillion, 18.79×18.79mm, Purple)
Color:
Actual size is set for screen
How big is a 13 carat trillion-cut Tourmaline?
It depends on the cut parameters and length-to-width ratio, but a typical size of a 13ct trillion-cut Tourmaline would be around 18.79×18.79 mm (±6%). Check how big it looks on a ring and finger.
Ring:
Skin tone:
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Ring width:
3.0 mm
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Saved...
64 mm
| Your settings | |
|---|---|
Ring |
Gold |
Skin tone |
Light |
Ring diameter |
16.9 mm |
Ring width |
3.0 mm |
Finger length |
64 mm |
Finger coverage |
112 % |
|
Saved...
|
|
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Ring diameter:
16.9 mm
|
Additional Info
Tourmaline has been a very popular gemstone since antiquity. It comes in a wide variety of colors, many times with two, or even three colors at once. It got its name from the Sinhalese word "turamali", which means "stone of mixed colors".
Where to buy?
For certified gemstones, high-end gemstone jewelry, and birthstone jewelry, see Blue Nile
Gem Details
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Name:
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Tourmaline |
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Shape:
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Trillion |
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Chemical Formula:
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N/a |
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Crystal Structure:
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Hexagonal |
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Hardness:
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7 - 7.5 |
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Specific Gravity
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3.06 |
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Carat weight:
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13 ct |
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Gram weight:
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2.6 g (0.0917 ounces) |
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Points:
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1300 pts |
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Length:
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18.79 mm |
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Width:
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18.79 mm |
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Est. face-up size:
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218.9 mm² |
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Volume:
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849.67 mm³ |
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Length-to-width ratio:
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1 |
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Refractive Index:
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1.616 - 1.650 |
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Luster:
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Vitreous |
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Wearability:
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Very good |
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Care Instructions:
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No special or unusual care |
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Color:
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Tourmaline can be found in the following colors:
                               
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Birthstone:
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Tourmaline is a birthstone for the month of October |
Popular comparisons:
- 4.93ct Tourmaline (Trillion, Red, 13.02 x 13.02) vs. 5.66ct Tourmaline (Trillion, Green, 13.64 x 13.64)
- 2ct Tourmaline (Trillion, Violet, 9.64 x 9.64) vs. 6.5ct Tourmaline (Emerald, Violet, 12.97 x 9.61)
- 2.5ct Tourmaline (Trillion, Light Red, 10.39 x 10.39) vs. 1ct Sapphire (Princess, Blue, 5.37 x 5.37)
- 2ct Tourmaline (Trillion, Violet, 8.8 x 8.6) vs. 2ct Tourmaline (Trillion, Violet, 9 x 9)
- 1ct Tourmaline (Trillion, Violet, 7.65 x 7.65) vs. 2.7ct Morganite (Trillion, Light Purple, 11.16 x 11.16)
- 2.7ct Tourmaline (Trillion, Violet, 10.66 x 10.66) vs. 3ct Ruby (Emerald, Red, 9 x 7)
- 1ct Tourmaline (Trillion, Violet, 7.65 x 7.65) vs. 1ct Diopside (Marquise, Green, 10.52 x 5.26)
- 1ct Tourmaline (Trillion, Red, 7.65 x 7.65) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)