An Art Deco diamond brooch,

An Art Deco diamond brooch, central old mine cut diamond, approximately 4.9 x 4.5 x 2.2mm, estimated approximate weight 0.33ct, flanked by four old mine cut diamonds and two single cut diamonds, surrounded by a pierced border of old mine and single cut diamonds, estimated approximate total diamond weight 2.30ct, dimensions 6 x 1.4cm, pin and roller catch fitting, unmarked, tested as platinum, weight 9.8g