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Cobalt Polished 4mm Half Round Band Weight 43.36 14K Yellow Imitation Amethyst YouthCobalt Polished 4mm Half Round Band Cobalt, in its pure form, cannot be used in jewelry. As a result, cobalt is alloyed with other metals to make it stronger, more malleable and more wearable. Cobalt used in jewelry is often alloyed with metals such as chromium, tungsten and iron. Because the chromium content can be quite high, cobalt is also known as cobalt chrome. This is just another name for the same metal. Cobalt is a relatively affordable metal