Australian black opal brooch, marked 14K gold below pin back, with a platinum (acid-tested)top, Edwardian, c. 1900's; opal is approximately 12 carats, 19.2 mm by 13.4 mm (leverage gauged) , accented by 4 mine-cut diamonds, approx. 1/3 ct t.w. and 12 natural pearls; 1 1/4 inches top to bottom, 15/16 inches wide, 9.0 gr gross wt
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Edwardian Australian black opal brooch