An opal, emerald and diamond brooch, Oscar Heyman & Brothers.  Photo Bonhams

in the form of a fish, with scales of opals, cabochon emerald eyes and further detailed by round brilliant-cut diamonds; with maker's mark for Oscar Heyman & Brothers, no. 200403; estimated total opal weight: 14.55 carats; mounted in eighteen karat gold; length: 3in. Sold for US$18,750
Bonhams. Fine Jewelry, 13 Dec 2011. New York, California, Los Angeles and California, San Francisco