Help ID Maker Of Brooch

[chadkeath]

Hi and hope everyone is having a good day. Thank you also in advance for your help. It is appreciated. I have a brooch/pin that I am trying to figure out information on this beautiful piece. Has a mark on back that is of a Big letter C and a 4 pointed star inside it. Very well made piece. Hope you can help with any information. I have looked, but have come up empty on maker.

 

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[ARC]

here is a better picture.

 

[GoldieLocks]

This is very 1920's costume jewelry. There is a specialist in Redding, CA with a used store. I think costume jewelry is in the store's name. You might try looking him up. He is really nice!