A colourful, interesting almost celestial jewel, opal is a unique gem by being amorphous in nature. Deriving from the Sanskrit word for "stone", approximately 97% of the World's supply comes from Australia. There are some stunning varieties, the most popular being Fire Opal, Boulder Opal, Lightening Ridge Opal, Harlequin Opal, Black Opal, White Opal, Jelly Opal and Precious Opal. All display some sort of opalescence - a term used to describe the beautiful play of colours. It is a truly fascinating gemstone, which is formed by silicone oxide, and has been found in fossilised dinosaur bones and once even in the skeleton of a cat! Often seen in rough pieces, offering more unusual jewellery styles, choose some opal jewellery to make a true statement about the colours of your personality.