Silver Ore from Cobalt, Ont. was discovered while working on the railway in 1903. It became one of the richest silver producing areas in the world. This stone is framed in sterling silver with a portion of the stone open in the back. The plain bail has a 7 mm inner dimension to accommodate a heavy chain. Total length – 70 mm x 32 mm wide. Weight – 29 grams. Design and lapidary work by John DeLong.