Black Opal Australian, Faceted 3mm Round - 15-16 Inch Indigo Gabbro It contains inclusions such as

It contains inclusions such as copper and iron

the third to hardest common natural gemstone

which may contain iron oxide

as well as a lucky stone for sailors

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 It contains inclusions such asBlack 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."