The Australian Opal and Diamond Collection mines its precious gem stones from the world renowned Opal fields in Australia.
Australian Opal is found at the following mine locations:
Coober Pedy | Andamooka | Mintabie | Lambina | Lightning Ridge | Opalton
Opal is a form of silica, chemically similar to quartz, but containing water within the actual structure. Precious Opal usually contains 6-10% water and consists of small deposits of silica spheres arranged in a regular pattern.
There are six different types of opal to consider:
Black | Boulder | Crystal | Milky | Doublet | Triplet
A three layered gem adhered together comprising first of clear capping usually quartz. Second precious Opal and third a common Opal backing. This process allows for a colourful stone at a fraction of the cost.
A two layered gem adhered together, comprising first of the precious Opal. Second common Opal backing. This process is similar to a venire.
Milky Opal is a solid form of Common Opal. Sandstone and potch (impurities) make up the base of this stone, thus giving it a cloudy milky appearance. Commonly mined in Coober Pedy, South Australia.
Boulder Opal is a Solid form of Opal. It comprises of natural Iron stone. This Iron is the host structure and often has an undulating surface. Commonly mined in Quilpie, Queensland.
Crystal Opal is a Solid form of Opal. It is a full silicon base as host structure. It has little impurity hense allowing light light pass through, giving a translucent appearance. Commonly mined in Andamooka, South Australia.
Black Opal is a Solid form of Opal. It has a manganese oxide base as host structure. The level of manganese is indicated by a index level from N1 being the darkest to N7 the lightest. Black Opal is considered to be the most rare and is mined in Lightning Ridge, New South Wales.