Dishta collar necklace circa 1950

I bought this necklace in an Antique store in Oklahoma and I know it is a Dishta necklace and I know it is fairly old and it is unsigned. What I would like to know is if it could be by Frank Dishta since it is unsigned or are there other Dishta family members who would not have signed their jewelry? Thanks in advance for any information. I am new here and very happy to be included in the discussion.

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Both Frank and Virgil didn’t sign work. I imagine this necklace to be the work of Virgils. Thanks for sharing, a beautiful piece.