Thursday, November 1, 2012

Gemstone of the Week: Grandidierite


(Grandidierite image found on blog.johareez.com)

Grandidierite is a beautiful, but little known gemstone.  It was discovered in 1902 by Alfred Grandidier after whom it is named.  Grandidierite considered to be a very rare gem and has a lovely blue-green colour.  Its luster tends to be vitreous or pearly and may be transparent (although is is quite rare) or translucent and has a hardness of 7.5.  Grandidierite has an orthorhombic crystal structure.  Grandidierite may be found in: Australia, South Africa, Czech Republic, Germany, Norway, Greenland, and the states of New York and Wyoming.  Some of the sites I have read said that Grandidierite may be as high as $50,000 per carat for high-quality, transparent stones of good colour, whether this is accurate, I'm not sure, but the few translucent  stones I've seen were quite pricy also, so an eye-clean transparent one would certainly be expensive.