There are as many worlds as there are kinds of days, and as an opal changes its colors and its fire to match the nature of a day, so do I.'
What is Opal?
Opal is formed from a solution of silicon dioxide and water. As water runs down through the earth, it picks up silica from sandstone, and carries this silica-rich solution into cracks and voids , caused by natural faults or decomposing fossils. As the water evaporates, it leaves behind a silica deposit.
What is Precious Opal?
"Precious opal" is the name used for any opal that exhibits "play-of-colour". Play-of-colour is the familiar flash of bright colourful light that a person sees when viewing opal. Black opal, white opal, crystal opal, boulder opal, and matrix opal are all varieties of "precious opal".
What is Play-of-Colour?
Play-of-colour is an optical phenomenon that occurs when light enters an opal, interacts with its internal structure, and leaves the opal in a flash of spectral colours. A single piece of opal can have an almost unlimited number of appearances. Its appearance will constantly change::
as it is moved under a light source;
as the light source is moved, or;
as a person changes their angle of view.