Circa 1960s, 18k, by Gunter Wyss, Switzerland. This one-of-a-kind ring by the revolutionary goldsmith Günter Wyss is a visual and technical marvel. Set with an intense blue aquamarine (12.0 carat), it is made from one continuous piece of 18k white gold. His designs and techniques were groundbreaking, but alas, his body of work is limited as he passed away at 37. Highly sought after by museums and collectors alike, this piece is in excellent condition. Remark: "Günter Wyss was highly…