Opal Is Rainbow Stone - Indonesia is rich in natural resources . Starting from plants , animals to rocks . Indonesia also producer beautiful gemstones . Gemstone Opal or also known as the opal of Banten until now the best in the world because it has a great variety of colors than from Australia or Latin America . during this gemstone from Banten Opal has advantages over other countries in the world . Excess rock Opal Banten , in addition to the color does not disappear also very fascinating if you see different colors , such as black , brown , yellow, purple , blue with rainbow colors . Opal has kind of colors, including Opal White , Green Crystals , Rainbow Crystals , Crystal Green , Tea and Coffee , Rainbow , Crystal milk and others . " All kinds of colors Opal has a special attraction is also the emission color of the rainbow can be fickle . That excess Kalimaya stone . Opal coal producers in the di