Cobalt symbol. Chemical element of the periodic table. Vector Chevrolet Cobalt 1.8 Automtico: fotos, preos e especificaes Cobalt Definition, Facts, Symbol, Discovery, Property, Uses Cobalt (Co) Periodic Table (Element Information & More). A stylish choice. This Cobalt chrome ring is 7mm in width and features a hammered finish. Cobalt Chrome is 4x times harder than Platinum, 5x harder than Gold and 7x harder than Silver: Cobalt is the ultimate contemporary metal. This naturally inert Cobalt contains a special blend of Cobalt and other alloys that exude extremely high lustre and reliable strength. Only available in size U