Australian Black Opal is the most unique, rarest and valuable gems in the world. No two are the same. www.blackopalaustralia.com.au
Australian black opals are the most valuable and widely known type of opal. It is produced in a variety of grades from the relatively inexpensive up to around $20,000 per carat for the rarest, most exquisite gems. Black opal is characterised by a dark body tone which can range from dark grey to jet black. However this refers only to the body of the stone, and is not related to the spectral colours present in the opal. Some people expect a black opal to be completely black. Unlike ordinary opals, black opals have carbon and iron oxide trace elements present, which cause the unusual darkness of the stone. Because of their dark body tone, the rainbow colours in a black opal stand out extremely better than lighter opals.
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