Platinum and Diamond 'Ecaille' Brooch, René Boivin. Photo courtesy Doyle New York.

The pierced oval brooch of fish scale motif, set throughout with 35 old-mine and old European-cut diamonds approximately 4.25 cts., accented by single-cut diamonds, with maker's mark, slightly obscured, and French assay marks, circa 1925, approximately 9.8 dwts. Estimate $20,000-30,000 

Doyle New York. Important Jewelry. Wednesday, September 25, 2013 at 10am - http://www.doylenewyork.com