An Australian opal doublet is a layer of light precious and
natural Australian opal attached to a background made of black
potch ( black opal without fire) or nowadays boulder from
The opal used is an opal from , in the State of South Australia.
It is an opal composite.
It costs a lot less than a solid opal and can last many years without deteriorating.
It is sensitive to water.
Do not get it wet or immerse in water.