Murano glass bead made with a core of opaque black and encased in transparent colors with an overlay of splashes of silver. Makes for a bead with lots of depth. Size is approximately 15 x 18 mm and 7 mm thick. Handmade in Murano. This style is known as Tosca but in this case with the base of black and with Verde Marino (a greenish aqua) over the small irregular shapes of .925 Sterling silver which creates a little window of color. The exact shape and placement of the little windows is random and no two ever exactly alike. The hole is approximately 1mm and runs through the center lengthwise.