Identification Help

Hello, I recently inherited this brooch and was hoping someone could possibly identify the maker for me? I am guessing it is Navajo and because the three center stones are faceted, I am thinking that it is a modern piece vs. older. The piece is approx. 2 3/4" X 1 3/4". I do love the the piece regardless of age. Any help would be greatly appreciated. Thank you very much!

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