Blue Tourmaline 4mm Microfaceted Round A Grade - 15-16 Inch 15x30 Yellow Opal is transparent to

Yellow Opal is transparent to opaque

which is not Jasper but rather a combination of Feldspar and Quartz

It was originally named for the visible inclusions of the mineral Cacoxenite

and is a result of trace amounts of copper or chromium

sometimes containing rainbow inclusions

Blue Tourmaline 4mm Microfaceted Round A Grade - 15-16 Inch 15x30 Yellow Opal is transparent toBlue Tourmaline ranges in color from green to blue to yellow to green with black, milky white and clear, colorless inclusions. It is an aluminum borosilicate mixed with iron, magnesium and other metals that give it its color. Tourmaline occurs in nearly every color in the rainbow and its name derives from turmali, the Sinhalese word for mixed color precious stone. Tourmaline is unusual in that it is both pyroelectric and piezoelectric, meaning it