Rock blue chalcedony earringsDescription Bororo's signature rock earring with a pair of rounded blue chalcedony. The light purplish blue color of chalcedony gives a soft tone to the rounded rock earrings. The pieces in the rock series are made by applying the Japanese traditional method 'Dozuri'. This technique shapes the ring when the stone and metal are attached to create its seamless look. Every single rock ring is unique because from the designer's selection of the rough