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

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

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

For many, fossiliferous tree resin, primarily amber, gained wide visibility to the public in 1993 wh