Skull pendant with articulated jaw, It is strung across the skull. 21mm. Robert Burkett is a world-recognized jewelry maker and has been called the finest beadmaker in America. He works primarily in silver and shibuichi, a Japanese process where silver is mixed with copper to produce stunning arrays of color and form. The pieces below are crafted by hand using the lost-wax casting technique. Highly collectible, his pieces are versatile and affordable while being unique, one-of-a-kind pieces.