Squash Blossom Necklace Info

This piece was trapped in my aunt’s chest for maybe 50 years and in my safe deposit box the last 10 years. Interested in learning more about it. Stamped CB on back. Assume it is SS but don’t know for sure. Should I try and clean it up? Any info you can give me would be greatly appreciated.

Thank you,

I am sorry, but could you give me a bigger picture, can not make out the stones and other clues, thanks for sharing