The opal is unique to Australia and it is considered one of the top ten gemstones in the world. In Greece, the opal is known as the “gem of hope.” The word "opal" originates from the Latin term opalus, meaning precious stone. Australia is arguably the main supplier of opals, accounting for the majority of the world’s supply, making it Australia’s national gemstone.
根據澳原住民的傳說，澳寶中璀璨琉璃般的色彩是彩虹落入地球時創造出的。早在公元前 250 年，古羅馬帝國認為澳寶象徵著好運，同時視其為希望和純潔，是丘比特之子的化身。
According to the indigenous Australians, opals were created when a rainbow fell onto the Earth. As early as 250 B.C., the Roman Empire considered the opal a symbol of good luck, hope and purity. and they believed that the gem was the embodiment of Cupid’s son.
In fact, according to the Australian Opal Cutters ebook, opals are formed when water runs through the earth and collects silica from sandstone. This silica-rich solution then runs through cracks and voids caused by natural faults and decomposing fossils. The water eventually evaporates, and the deposits harden forming the common opal, or in rare circumstances, the precious opal. The opal’s value is dependent on its type, brilliance, pattern, colour, body tone, size, faults and the cut and polish of the stone, among other factors. In value, these “rainbow pieces” can fetch anything from AUD $10 to $100,000.