Opal: " For in them you shall see the living fire of the ruby, the glorious purple of the amethyst, the sea-green of the emerald, all glittering together in an incredible mixture of light." ~ Roman Pliny the Elder on Opal, Century AD--iridescence
This fine Ethiopian opal measures in at 88 carats, a lucky number in the Chinese culture. It is very difficult to find clean rough in this size from the Ethiopian deposits, and this stone would be expensive simply for its quality and size in any case.
malformalady: Koroit opal — The Koroit opal field is an opal mining area in Paroo Shire in South West Queensland, Australia.The Koroit opal field is known for the very distinctive type of boulder opal that is found in its mines