Art Nouveau Stick Pin Tourmaline 14K Yellow Gold Imperial Russian. Art Nouveau era Russian Imperial 14k. 585 yellow gold stick pin with a crescent moon form head, accented with greenish blue color Tourmaline cabochon. This great pin is 2 1/2 long, the head is 10 mm x 11.5 mm, total weight is 2.2 grams. The stone is 4.8 mm in diameter.We will be happy to assist in this. We will respond within 24 hours.