Gold is a chemical element with symbol Au and atomic number 79,
making it one of the higher atomic number elements that occur naturally.
In its purest form, it is a bright, slightly reddish yellow, dense,
soft, malleable, and ductile metal. Chemically, gold is a transition
metal and a group 11 element.
Diamond is a solid form of the element carbon with its atoms arranged in a crystal structure called diamond cubic. At room temperature and pressure, another solid form of carbon known as graphite is the chemically stable form, but diamond almost never converts to it. Diamond has the highest hardness and thermal conductivity
of any natural material, properties that are utilized in major
industrial applications such as cutting and polishing tools. They are
also the reason that diamond anvil cells can subject materials to pressures found deep in the Earth.
Platinum is a chemical element with symbol Pt and atomic number 78. It is a dense, malleable, ductile, highly unreactive, precious, silverish-white transition metal. Its name is derived from the Spanish term platino, meaning "little silver".
Silver is a chemical element with symbol Ag and atomic number 47. A
soft, white, lustrous transition metal, it exhibits the highest
electrical conductivity, thermal conductivity, and reflectivity of any
metal.