Pink to Red and Violet Diamonds from the Argyle Mine, Australia: Properties, Color Origin and Latest Research Results

Corundum, encompassing the highly prized ruby and sapphire varieties, stands as a cornerstone of the

Gem-quality sapphires containing ‘exotic’ elements such as Sn, Nb, Zr, Ta, W, are of special int

A newly observed variety of faceted transparent brown sapphire has recently entered the gem market,