Adorn yourself with this sterling Silver earrings from Coober Pedy in South Australia. Jewellery that showcases a Natural Australian Light Opal engraved with 925. This type of opal is commonly known as Crystal or Light Opal and is classified by the Opal industry as Natural Opal Type 1, owing to its translucent and substantially homogenous chemical composition, free from oxides. Genuine Natural Australian Crystal Opal is a rare gemstone that can be found in limited quantities in the Andamooka, Lightning Ridge, Coober Pedy, and the Queensland Boulder Opal Fields. The opal is composed of hydrated amorphous silica SiO2nH2O arranged in closely packed planes of silicon dioxide molecules. Its clear crystal appearance and high translucency are due to its pure hydrated silica SiO2nH2O composition, which is free from impurities like Magnesium or Iron. Precious Light Opal may be a mineraloid with an internal structure, but it displays an ever-changing play of internal colors. Microscopically, it is made up of silica spheres arranged in a hexagonal or cubic close-packed lattice, ranging from 150 to 300 nm in diameter.