Explore comprehensive opal gemstone information covering varieties like black, fire, and boulder opals, their colors and patterns, historical significance, care tips, and symbolic meanings for enthusiasts … Opal is the product of seasonal rains that drenched dry ground in regions such as australia’s semi-desert “outback. ” it is known for its unique display of flashing rainbow colors. Photos of opal from around the world.

For use in jewellery, most opal is cut and polished to form a cabochon, a convex shape that maximises the viewing angles through which an opal's play of colour can be observed. Natural opal refers to …