Very Large Vintage Pins With Rhinestones and Enamel

These are two very large (over 3 inches) costume pins. I bought them because of their size and design. Both have seen better times and need some TLC. I am not sure but one of them looks like it is made of pot-metal. Neither one is marked.
Can anyone help with the age, please? I can't tell why, but the first one reminds me of the 1920's - but this is just a guess.

Thanks for looking:)