10.00ct Lightning Ridge black opal bar brooch set in a white gold setting tested as 18ct. Approx 1@ 10.00ct oval opal with very bright green and blue colours, speckled patch work and broad flash, natural growth marks. Brooch length 2.44 in. circa 1st half of 20th century.
- Circa - A Latin term meaning 'about', often used in the antique trade to give an approximate date for the piece, usually considered to be five years on either side of the circa year. Thus, circa 1900 means the piece was made about 1900, probably between 1895 and 1905. The expression is sometimes abbreviated to c.1900.
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