Many said the rarity exceeds a thousand times more than diamond, Tanzanite is considered to be acclaimed as the "rarest gemstone in the world" title. Discovered in 1967, this gemstone is found ...
1991), Canada (Lonker, 1988), Antarctica (Carson et al., 1995), the Czech Republic (Cempírek et al., 2010), and other localities. Yet gem-quality grandidierite is extremely rare. Facetable gem ...