Natural Australian Black Opal Oval Cabochon Size: 13.04 x 7.59 x 2.74 mm Weight: 1.71 ct Color : Deep grey base with intense play of colors. Treatment: No indications of treatment Origin - Australia - Lightning Ridge (opinion of the seller) - Got from the source. Certification: ALGT Belgium report no: 89737787. Shipment will be insured and trackable. Duties and Taxes are the buyers' responsibilities. Black opal is the rarest and most valuable of all opals and is generally found as a bar of various colors in a dark body. Lightning Ridge in New South Wales, Australia is the worldwide home for black opal and is widely regarded as producing the best black opal in the world. It is here that ages ago, nature hid the earth’s rarest gem, the black opal. Opalholics - Now is the time to buy investment opal because the supply of high-grade black opal is thinning, and the mining community of Lightning Ridge as a whole is not finding many opals, which can only mean one thing for prices. Pictures have been taken under natural daylight and white light with magnification and with different backgrounds, intended to display as accurately as possible. But it may slightly vary. Please check the measurements from the text above to get a real idea of the stone.