Monthly Archives: October 2017


Opal – October’s Birthstone

Opal is the birthstone for October, and Australia’s national gemstone. It is a hydrated amorphous form of silica, classed as a mineraloid. Opal is formed from a mixture of silicon dioxide and water. This creates silica deposits that eventually form an opal. It comes in multiple colours. This includes white, grey, red, orange, yellow, green, blue,… read more…

Categories: Birthstones