Black Star Sapphire Cabochon, Blue: Cost & Trends 2026
Editor’s NoteThis article explores the enduring appeal of black and blue star sapphire cabochons, highlighting their unique optical properties,…
Cabochon
【Aappaluttoq,】Greenland Ruby Update | Gems & Gemology
Editor’s NoteThis update from the Spring 2019 issue of *Gems & Gemology* details the operations of Greenland Ruby, which began mining ruby and pink…