"Black opal" is a term used for opal that has a dark body color, often black or dark gray. The term is also used for opal that has a dark blue or dark green body color. The dark body color often makes the fire of black opal more obvious. ... It was mined at Lightning Ridge, Australia, the "Black Opal Capital of the World".
Boulder Opal is a unique and beautiful opal found in Queensland, Australia. It is easily identifiable because it is a mixture of ironstone and opal either in a matrix or layered. Every stone is unique and they are arguably the most affordable opal available.
"Light opal" and "white opal" are terms used for opal material that has a white, yellow or cream body color. This is the most common body color for precious opal. These stones were cut from material mined at Coober Pedy, South Australia. They are calibrated 8 x 6 millimeter cabochons.