My grandmother gave me this ring when I graduated from high school. She said it had been given to her as well from a family member. My grandmother immigrated from Germany in the 80's and for sure had this during WW2. She was born in the early 30's so I'm thinking this Necklace must be from between 1900 and 1930 but this is just a guess. I've tried looking up the bug-like hallmark to no avail. The back has some kind of stamp and "585". Unsure of gem within the pendant part, it is however, surrounded by diamonds. Has anyone seen this or know who it was made by? Value?? Please note that the black flecks are NOT on the necklace, just areas on my phone that no longer have pixels.