Art Deco 14K White Gold Hardstone Cameo Filigree Black & White Brooch

Elegant white relief on a black background with wonderful detail, this piece circa early century. It fashioned a lovely couple side by side head bust, carved on a white hard stone on a black ground, ornate filigree open work frame. 
Fully functional pin and catch. In excellent condition with no issues to note.
Size 1 5/8" x 1 1/4", weight 11.5 gram, hallmark 14k