Colored gemstones of metamorphic origin: Progress report in understanding how they crystallize at depth in East Africa, the Hindu Kush, Pamir Mountains, and the Middle-Urals Ring Structure

This paper aims to present the history of the modification of Baltic amber (succinite), and particul

Synthesis methods to produce large and high-quality dia- mond for jewellery have been improved over

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