All these rings are sterling silver. The grey/black colour/tone comes from their patina. A patina is a chemical reaction where the metal oxidizes. I build up my patina in multiple layers to achieve the look I want.

You can choose to have a darker or lighter patina. A lighter patina will look more silvery. The patina slowly wears off the more prominent parts as you wear it.

Here’s some examples of darker/lighter patina’s