3.0ct minimum mm varies oval tanzanite. mineral species zoisite mined only in tanzania africa. best to avoid sudden temperature changes and rough handling.
minimum .30ct 6x4mm oval chrome tourmaline. chrome tourmaline is colored by chromium and is the most valuable of the green tourmalines. it ranks a 7 on the moh's hardness scale and is not enhanced. chrome tourmaline is found in madagascar north ameri
min .30ct 5x5mm trillion chrome tourmaline from tanzania. chrome tourmaline is colored by chromium and is the most valuable of the green tourmalines. it ranks a 7 on the moh's hardness scale and is not enhanced. chrome tourmaline is found in madagasc