Vintage Sterling Silver 925 Cz’s Eternity Rings pendants Necklace Elegant

This is a lovely Necklace with a double pendant which consists of two circles, one that fits inside the other. They both have CZ‘s along the entire circle they appear as diamonds. The pendants and chain are all sterling silver. Please see photos for approximate measurements and further details. Dependence are both signed 925 CH And have a hallmark of some sort that I don’t recognize. The chain is signed 925.