Zirconium dioxide jewellery. Like diamond, cubic zirconia has a cubic crystal structure and a high index of refraction. Visually discerning a good quality cubic zirconia gem from a diamond is difficult, and most jewellers will have a thermal conductivity tester to identify cubic zirconia by its low thermal conductivity (diamond is a very good thermal conductor). This state of zirconia is commonly called "cubic zirconia", "CZ", or "zircon" by jewellers, but the last name is not chemically accurate. Zircon is actually the mineral name for naturally occurring zirconium silicate (ZrSiO). Zirconium dioxide Zirconium dioxide (), sometimes known as zirconia (not to be
Coca Crystal Coca Crystal Coca Crystal (December 21, 1947 – March 1, 2016) was an American television personality and political activist. She was best known for her weekly cable-access variety show "The Coca Crystal Show: If I Can't Dance, You Can Keep Your Revolution", which ran from 1977 to 1995. Born as Jacqueline Diamond on December 21, 1947, to Jack Diamond, owner of J. Diamond Furs and Rita Dunn, a former fur model. She was born in Manhattan and raised in Mamaroneck. Starting in 1969, she was a contributor to the East Village Other (EVO) and the name Coca Crystal was created