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Rubies & Sapphires are often heated as a way to improve their Color and Clarity. When a ruby or sapphire is heated, it can become a deeper, more vibrant color. Heating can also help to remove impurities and internal fractures within the gemstone, which can make it appear more transparent and lustrous. The process of heating rubies and sapphires is a common practice in the gemstone industry and is generally considered a safe and acceptable treatment. However, it is important to note that heat treatment may affect the value of a ruby and sapphire, as untreated gemstones are generally considered more valuable.