Dolphin in chalcedony vertically on the wave always in chalcedony in shades of blue. Chalcedony was invented in Murano in the 15th century and rediscovered by Maestro Lorenzo Radi in the first half of the 19th century. Its difficult preparation involves the addition, in the glass melting crucible, of various metallic compounds and silver salts that create the shades of colors. Each master has his own formula and color shades. This piece was made by Maestro Andrea Tagliapietra. Certificate of guarantee of work performed by hand according to the ancient Murano techniques