Great platinum Blue Zircon and Diamond ring. Setting is hallmarked "Platinum". There is a large round Blue Zircon stone set with double prongs. Three small Diamonds on each shoulder. All of the stones are European cut. The Zircon measures approx. 3/8" round. I am not a gemologist, so I do not know ct. weight. The Diamonds are small, possibly 5-10 points each. The ring is size 6 1/2. Weight is 5.1 grams. I would date this ring at c1930's-50's. Condition is very good, with very minor edge wear to the Blue Zircon. The stone is a bit cloudy in areas. If the buyer wants to remove the Blue Zircon and have it polished, that could be done by any reputable jeweler. I don't change the jewelry I sell, so I leave this to the buyer.