Lamina Lattice: Sterling Silver Double RingCreated from the ancient technique of cuttlebone casting, the Lamina Double Ring demands mindfulness and respect for the environment and all life on earth. Handmade with Sterling Silver The blackened sterling on the ring (low parts in the design) is made with Sterling Sliver process though patination. Simple chemistry is used to speed up the oxidation process of the silver and turns it black. Then the high spots on the silver are polished to give the