Product｜Australian Black Opal・Australian Lightning Ridge Black Opal Quality｜Several important places of opal production, almost all of them are included. But no matter what kind of opal, none of them can compare to this legendary place of production - Lightning Ridge, Australia. The famous Lightning Ridge opal is highly sought after and collected by people all over the world, because its color level is far beyond any other opal, and its play of color does not drift, but is naturally arranged and combined, resulting in a series of paintings like the style of Vincent van Gogh's oil paintings. There was once a Lightning Ridge black opal that looked like a miniature version of Van Gogh's famous painting - Under the Stars, and was purchased at an auction for over NT$100 million. At that time, even a kilogram-level Tanzanite blue-purple unheated original crystal column was sold at a price of less than half the price of a small black opal. There is no doubt that the Lightning Ridge black opal in Australia is indeed the most valuable gem in the world. This black opal is double-layered and has a "cushion" treatment. This is because opal is formed in the cracks of rocks. Only a thin layer of opal can be taken out by chiseling it open. Because it is too thin to be made into jewelry directly, minerals such as agate and jade are used as substrates. A thin layer of precious opal is spread on it and then fused to become a durable black opal that can be used for decoration. This treatment is only for thickening, especially for rare and precious opals such as Lightning Ridge, which are necessary for commercialization. Net | N/A Quantity | 1.51 carats Shape | 14.1 x 5.5 x 2.6 mm | Teardrop-shaped cabochon [Long Pear Doublelet Cabochon]・Cut & Polished by Dan Stair, USA Color | Multicolor