found old( I believe) necklace and bracelet in barn cleaned and found marks

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the necklace is 18 inches long and has italy on one side of hasp and 925 other side is marked with a circle and a "ca" in it . the bracelet(71/2"} is marked the same. it is a flat chain that has heart shapes all along the suface that is made from the section of it bieng polished and the rest of flat surface is kind of brushed the back is plain