Osmium is a chemical element with the chemical symbol Os, atomic number 76, and atomic weight 190.23 u. Osmium is a hard, brittle platinum-group transition metal with a distinctive bluish-white luster.

Due to its extremely high melting point, its processing is extremely complicated and difficult. Lausanne used a distillation method to heat it at a high temperature of 3,033 degrees Celsius (the melting point of osmium) in a closed space, and the melted and evaporated osmium turned into a gas and rose. Condensed at the top of the confined space. After cooling, it condenses into non-toxic osmium crystals. It becomes good with osmium but not poisonous, and it also forms very unique and absolutely unique crystals. This osmium crystal, which varies in size from 0.1 mm to several millimeters, makes Hublot's osmium crystal dial a true marvel. Rareness, uniqueness to Hublot and difficulty in processing are the three attributes of the material osmium at present. It is precisely because this watch of Hublot is shaped like a star after crystallization, it is named the sky.