Cobalt is a highly durable cobalt alloy that has been used in medical implants and the dental industry for years, cobalt jewelry employs the same cobalt chrome alloy from these industries for its extreme strength and high resistance to scratching. Cobalt wedding bands are created with an alloy of cobalt and other metals, such as chromium, tungsten, or iron. However, cobalt hasn’t been used in jewelry for as long as more popular metals like silver and gold.