Noun
glass containing lead oxide; has a high refractive index
Source: WordNetFilling the fractures inside the ruby with lead glass (or a similar material) dramatically improves the transparency of the stone, making previously unsuitable rubies fit for applications in jewelry. Source: Internet
In the neck and the funnel of the tube, lead glass is used for this purpose, but this type of glass shows a browning effect due to the interaction of the X-rays with the glass. Source: Internet
Rubies over 10 carats (2 g) with large fractures were filled with lead glass, thus dramatically improving the appearance (of larger rubies in particular). Source: Internet
In addition, artist Etienne Leperlier cast a "crystal" lead glass duplicate of the wax replica of the carved Côte de Bretagne. Source: Internet
Another treatment, which has become more frequent in recent years, is lead glass filling. Source: Internet
Glass and plastic welding The welding together of two tubes made from lead glass A bowl made from cast-glass. Source: Internet