Art Nouveau
group of stick pins, four:
(left to right)
1) Mermaid serenading a swan, 14K yellow gold (stamped marks)
2) profile of a lady's bust, 14K and 10K yellow gold, (1) Old European Cut diamond (unmarked)
3) Art Nouveau lady's head, 10K yellow gold (stamped purity mark)
4) bust of a woman, 14K yellow gold, (1) Old European Cut diamond (stamped purity mark)
longest, face: 1/2"w x 7/8"h; overall: 2 7/8"l

Each having expected wear with age and use.
1) 1.2 dwts
2) Using a Kee Electronic Gold Tester, the head reads as 14K gold and the pin reads as 10K gold. 2.1 dwts
3) 0.5 dwts
4) 0.8 dwts