Ethiopian Fire Opal - retailer rough

This is for 1-Ethiopian Opal - rough, from Ethiopian. Photographed in front of an inch ruler. You get retailer the one shown.
This weighs approx. 4.1 grams.

Opal- is a hydrated silica which forms in microspheroids. Light bouncing off the spheroids causes opal's spectrum of color flash. when water dehydrates from opal, it can produce forms of chalcedony, such as agate, jasper, onyx, chrysoprase, blood-stone or flint.