The opal of down under mainly comes from the town of Coober Pedy in South Australia. The world’s largest and the most valuable opal named “Olympic Australis” was also found at the “Eight Mile” opal field in Coober Pedy weighing 17,000 carats (3450 g). Opal is the national gemstone of the Australiaespecially black opal of Australia is claimed to be of the finest quality in the world.Australia is renowned for producing the high quality opal like matrix opal, crystal opal, and the rarer black opal in which the pipe opal is the rarest. Brahmagems is a reliable haunt of the certified gemstones where you can buy Australian Opal online or offline.