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 Home / Gem Library / Natural Gemstones / Sphene October 20, 2019  


Natural Sphene
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There are 164 Sphene(s) available at Multicolour.com


Sphene is a rare collector stone with an unusually high refractive index and and a hardness of 5 -5.5. Because of it's high dispersion and refractive index, a well cut sphene can display stunning brilliance. Sphene is somewhat soft and as a result is more suitable as a pendant than as a ring stone. Sphene is rarely very clean.


Known Facts
Color Key: Green, yellow. brown
Refractive Index: (1.885-1.990,)-(1.915-2.050)
Chemical Composition: CaTiSiO5
Hardness: 5.5
Density: 3.52-3.54
Crystal Group: Monoclinic
Ocurrence: Austria, Dheirene-Madagascar, India, USA, Brazil.

Brightness in gemstones is an attribute of visual perception in which a gemstone appears to be radiating light. But few gems actually radiate light and what we see is reflected light. Brightness in the context of gemstones is a subjective attribute and there is no way to quantify it.

The "fire" of Sphene derives from its very high dispersion combined with a high index of refraction. Gems with a high refractive index, and a high dispersion will usually elicit an impression of greater brightness. A diamond’s refractive index is 2.417 and its dispersion is .044. Sphene’s refractive index is 1.900 – 2.034 and its dispersion is .051 so it is arguably a top range brilliancy contender if brilliance could actually quantified.

The dispersion of sphene exceeds that of diamonds and shows flashes of gold, yellow, red and green that diamond cannot. And due to this high dispersion and pleochrism, a well cut stone can reveal a stunning brilliance that will vary in appearance as a function of the light source and the angle of view. Generally it is green, with just about every other color of the rainbow mixed in somewhere.


Illustrations
Sphene Sphene
Check our Top, Largest, Smallest or Latest Sphene's.


Sphene Stats/
Popularity Index: 25164980hits
Total Items: 164items
Total Weight: CTS 791.54
Cheapest: USD 6.86
Most Expensive: USD 16272.00
Largest: CTS 36.16
Smallest: CTS 0.25
Last Added: 09/09/19 10:10:56

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