Gem-quality pink fluorite from Planggenstock, Switzerland: chemical and physical properties and a comparison with pink fluorites from other localities

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

Performing a literature search is a very important—but often neglected—part of doing gemmologica

This study presents the results of an interdisciplinary archaeogemological investigation focusing on