Characterisation of Peridot from Sardinia, Italy
Gem-quality peridot is occasionally found as mantle xenoliths within basalts near Pozzomaggiore.
A Survey of the Gemstone Resources of China
China has identified many deposits with significant potential to produce gemstones; various species are discussed.
GIA Tests Extraterrestrial Gemstones for Down-to-Earth Elements
While scientists speculate about diamond planets hurtling through the galaxy, at least one extraterrestrial gemstone is already among us.