As trends along these lines continue into 2020, the transparent rough continues to be more valuable in their natural state. However, since the demand for transparent rough has increased in recent decades, treatments to create asterism are not frequently encountered. When corundum is heated to between 1200-1600 degrees Celsius, star sapphires can be created or improved. ![]() Knowledgeable gemologists will be able to discern whether a sapphire has been subjected to this kind of extreme heating. The results can be dramatic, transforming pale stones into ones with lively, saturated colors. Over the last couple of decades, high temperatures in excess of 1700 degrees Celsius has been applied to sapphires, which improves clarity by dissolving silk as it improves color. These are commonly used on pink sapphires from the mines of Madagascar and may also be applied to Madagascar’s coveted padparadscha sapphires.Īn unheated ruby with natural inclusions. Some heat treatment procedures are relatively mild, involving temperatures of about 400 degrees Celsius for brief periods of time. Heat treatment is used to improve a sapphire’s color, remove color zoning, and improve clarity. The oldest and most common sapphire enhancement is heat treatment, and the majority of the sapphires in the marketplace have been heat-treated or thermally enhanced in furnaces. What Does It Mean When A Gemstone Is Heated?īefore and after examples of heated sandpaper quality sapphires. This is especially important with the modern technology that is abundant in 2020. ![]() It is important to understand the ways in which sapphires may be treated so you can make an informed decision. Throughout history, it has been a common practice to treat sapphires in some way to enhance their color and clarity. ![]() The majority of commercial-grade sapphires have had some measure of treatment, the most common being heat treatment.
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