Black Opal Australian, Faceted 3mm Round - 15-16 Inch Indigo Gabbro Diopside is a calcium and

Diopside is a calcium and magnesium silicate mineral

as well as a lucky stone for sailors

light gray or black

Tourmaline is classified as a semiprecious stone and occurs in a vast array of colors

Blue Apatite ranges in color from light teal to blue to bright blue to dark blue to green

Black Opal Australian, Faceted 3mm Round - 15-16 Inch Indigo Gabbro Diopside is a calcium andBlack Opal is a naturally occurring variety of precious opal mined in Australia. this opal variety is characterized by their dark base tone. It is mined under extremely harsh conditions and the high grade specimens are more rare than diamonds. Australian Aboriginal tribes referred to Black Opal as "Fire of the Desert."