Mother of Pearl CuffBlack onyx and mother of pearl the darkest stone in the collection set against one of the most iridescent in a 7. 5" 925 sterling silver cuff with an 86mm stone arrangement. The Mother of Pearl Cuff uses material contrast as its entire design language. Mother of pearl's iridescence shifts between white, cream, and faint blue green depending on the light source. Against black onyx in a single piece, the effect is a study in opposites that somehow