T&R S Hallmark

I am going out on a limb with a guess to the hallmark being Tommy & Rose Singer. Kind of doubtful as all pieces that belong to the hallmark always spell out Singer.
Also, are the stones sugilite?

Thank you in advance for looking. :slight_smile:

Have to agree as I have not seen the Singers use periods after the initials either. Then again, that’s just my unqualified opinion!

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Here is a little more on Tommy & Rose Singer jewelry mark… T&R Singer, T. Singer, T and a crescent moon, http://www.twodogssouthwestgallery.com/tommy-singer-jewelry.asp