Vintage 9K bi-color gold and sterling silver brooch featuring a large black opal with blue, green, violet, and pink play-of-color weighing approx. 20.00 carats bezel set in an open elongated marquise frame of rose and yellow gold leaves with small touches of sterling silver blossoms and berries, 2 1/2 in. L, 12.7 grams

Additional comments added on 10/24/24: It appears to be a solid black opal. However due to the nature of the bezel mounting it is not possible to confirm Opal has small scratches on surface, bar pin is base metal. Unless stated in a laboratory report, gemstone and diamond color, clarity, and carat weight are approximate because stones are mounted at the time of evaluation