Authentic Murano Glass Blown in the furnaces of Murano. These are part of our Finestra (Window) line with opaque layers of trasparent Amethyst (purple) with black filigrana which forms the windows with its transparent sides. This is in the shape of an oval which measures approximately 35mm (approximately 1.38 inches) in length and 16mm across as at the largest diameter. The hole size is a nominal 3mm in diameter but will vary because the maestro is blowing melting glass.