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https://geology.com/gemstones/opal/fire-opal.shtml
Fire Opal - Pictures and Definition of Fire Opal
Fire opal is defined by its fiery yellow, fiery orange or fiery red background color. Many people see the word 'fire' and immediately think of the...
fire opalpicturesdefinition
https://geology.com/gemstones/opal/composite-opal.shtml
Composite Opal: Pictures of Opal Doublet and Opal Triplet
Composite opals are assembled stones that allow a small amount of precious opal to go a long way. They consist of a very thin slice of precious opal, mounted...
opal picturescompositedoublettriplet
https://geology.com/gemstones/opal/cats-eye-opal.shtml
Cat's-Eye Opal - Pictures of Cat's-Eye Opal
Photos of cat's-eye opal - opals that exhibit chatoyance produced by reflections from tiny parallel needles of rutile within the gem.
opal picturescateye