Gem quality sphalerite is a rare collector stone. The mineral is usually nearly black in color but is occasionally found in transparent pieces of an orange or yellowish brown hue. Clean pieces are extremely rare.
Amethyst -- Uruguay En suite with lot although this species of gem is frequently seen in the marketplace not all amethysts are equal: the present stone is exceptional for the vividness of its grape-purple hue, as well as its eye clean transparency a
The Guinness Book of World Records names Painite as the rarest gem mineral on earth. Painite has so far only been found in Myanmar, Indonesia. Painite colors vary from pink to brown. Painite will appear a different color when viewed from different angles.