Lot-of-2-Vintage-Silver-Turquoise-Rings-with-one-Sancrest-R-clip-on-earring

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 The earring is marked Sancrest  R on the back.

The two rings are sterling silver but they do not have any markings on them that I can find.

 The ring with the two stones looks to be about

 a size 7 1/2  

The ring with one stone looks to be about 

a size 4 1/4