Show worlds biggest gem what Is held to be the largest lagest uncut pre cloas stone in the world Is a flawless black opal discovered in this country and now said to be in the lie office of a government official in washington the gem contains approximately abely ai 21 cubic inches weighs carats barats and Is valued hy by the owners at the colors are tran translucent si it cut blues and greens with a little red the famous viennese opal which was without equal until tile the american specimen was found weighs carats barats but has a number of flaws |