Hogan & Bolas have been making "Handcrafted" jewelry in Providence, Rhode Island for over forty years. Started by Robert Hogan and Deborah Bolas -Rhode Island School of Design students - the company produced jewelry designs in copper and bronze. The artists, using various enameling techniques, designed and successfully produced an extensive line of enameled jewelry. Pieces were produced using traditional metalworking, combining hand and machine work.  This rare set is beautifully fire enameled copper with blues and greens.  Egg/oval shaped brooch is 1.5" across.  Screwback earrings in the same shape are 1" tall.  Lovely set for a collection!  I am happy to answer questions and thanks for looking.