This is a platinum ring with a blue stone. There are no diamonds and no markings that I can see. It tested as platinum. Weighs about 2.4 grams and is a size 7. The shank of the ring looks like it was sodered to the top part of the ring. It has a sort of knot style with little round balls. I was hoping maybe someone recognizes the style and maker and can tell me how old it is. I had an old ring that was very delicate that had a green stone in the center surrounded by peridot colored stones that was sodered to the top to so I think they were of the same time period. Maybe Victorian.