“Black Opal” is a type of opal that has a dark black or gray body color. The term is also used for opals that come in dark blue or green body tone. There is a small but famous town in Australia – Lightning
Koroit Opal is a type of opal that is popular for its exquisite ironstone that consists of gorgeous patterns and different hues. They are also larger in size and more valuable than any other kind of commonly-available opal.
Ethiopia is coming on as the second most dominant force in the opal market. The most appealing factor about Ethiopian opals is that they are more affordable than Australian opals and have the same quality wise as of Australian opals.