10k yellow gold antique pink gemstone shop ring size 6/6.25

Product Name: 10k yellow gold antique pink gemstone shop ring size 6/6.25
Solid gold signed 10k pink gemstone ring. I was told it was pink topaz when I got it but I think it's a paste (synthetic) stone shop. There is very minor scuffs mark's on top edge of the stone it's hard to picture and hard to notice, my point being topaz does not chip easily, paste stones do and are common in antique pieces. In excellent condition for it's age. The stone is tightly secure in setting. Weighs 1.25 grams. It's signed, im not sure what the makers mark is, second and third pic show 10k and makers mark. It appears to be (something) CO. Depending how it sits on my mandrel it is a size 6 or 6 1/4 . Can he resized by your jeweler If desired. It's a beautiful ring.