Custom opal jewelry comes in an exceedingly nice style of sorts and designs. What we have a tendency to mean by 'types' is that there area unit at least 3 types of mineral gem found within the outback of Australia in 3 basic areas. Australian state, NSW, and Australian state. however this is often not a geographics lesson. the main target is thereon illusory and rare gem termed 'opal' that, in keeping with historians has the that means of 'a modification of color'