Tanzanite, one of December's three official birthstones, is celebrating its golden anniversary. Fifty years ago, Maasai tribesmen discovered dazzling bluish-violet gems in the foothills of Mount Kilimanjaro in Tanzania. Originally thought to be sapphires, the mesmerizing stones were identified by the Gemological Institute of America as a never-before-seen variation of zoisite. The unusual mineral caught […]