Coober Pedy, Australia The first, a large white opal bead necklace with bright green and orange play-of-fire, graduating from 13.11 to 4.7 mm, weighing approximately 166.5 carats, completed by a silver clasp, length 18in. Together with a double-strand necklace, graduating from 8.7 to 3.7 mm, completed with a silver filigree clasp, length of shortest strand: 17 in. (2)