boulder opal
Boulder opal is an opal with sandstone or iron ore as its host rock, and it exhibits a play of color effect.
The main production area is Queensland, Australia.
Because it is often cut into unique shapes, it is a gemstone that can be enjoyed in many different ways.
Opal is the birthstone for October.
Karatz GemMagazine
" Boulder Opal "
Karatz GemMagazine
" Boulder Opal "