Art Deco
group of stick pins, six:
(left to right)
1) Mercedes-Benz logo, .800 silver, marcasites
2) 14K white and yellow gold, (4) diamonds, pearl (stamped purity mark)
3) silver, crystal, black enamel (unmarked)
4) gilt metal, pearl, gray enamel (stamped maker's mark "A & Co.")
5) 14K white gold, (7) diamonds, (2) blue sapphires (unmarked)
6) 10K white gold, (1) diamond (unmarked)
longest, face: 7/16"w x 5/8"h; overall: 2 1/4"l

Each having expected wear with age and use.
1) 0.7 dwts
2) 1.4 dwts
3) 0.9 dwts
5) Using a Kee Electronic Gold Tester, the item reads as 14K gold. 1.3 dwts
6) Using a Kee Electronic Gold Tester, the item reads as 10K gold. 0.6 dwts