Hopi jewelry, where one piece of silver has a pattern cut out of it and is then inlaid on top of a second piece, was really popular. This overlay style was picked up by some Navajo artists, like Yazzie, but he was the best at it. 

Unlike the Hopi overlay artists, he did not stamp or engrave the bottom sheet of silver, but rather just oxidized it to create the contrast between the top and bottom sheets. 

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