Yellow Jade 12mm Coin - 8-Inch 9x13mm Black Opal is a naturally

Black Opal is a naturally occurring variety of precious opal mined in Australia

Many of the earliest gem traders did not realize that these yellowish stones were actually different materials

Like all Opals

or even multi-colored

colored by trace amounts of chromium and/or vanadium to range in hue from yellow to green to blue to green

Yellow Jade 12mm Coin - 8-Inch 9x13mm Black Opal is a naturallyYellow Jade is not actually Jade, but a form of natural Serpentine which is commonly referred to as Yellow Jade in the stone industry. This semi to translucent stone occurs in an array of hues, from deep oranges to creamy off to white tones. As a Serpentine, Yellow Jade is a magnesium iron phyllosilicate and may contain other elements including chromium, manganese, cobalt or nickel.