Green and blue opal. This website is fantastic, and has all kinds of interesting opal facts!
Australian Black Opal
Classic Black Crystal Opal FOR SESSION PAGE
Rare and renowned Red-on-Black Opal - “The Flame Queen” / 263.18 carats / Australia
The Rainbow Opal - Australia It is an opalised fossil formed as a result of an extraordinary set of natural forces, found uniquely in South Australia. Weighing 72.64 carats, it is a uniform, solid block of intense colour discovered in Coober Pedy in 2003. It is also extraordinarily rare – being an opalised fossil of a belemnite, an ancient squid-like creature over 100 million years old.