![]() ![]() The type of mineral present will determine the color of the sapphire produced. Made of the mineral species corundum, sapphires are formed deep within the earth’s crust as corundum and trace minerals cool over time. These inclusions and the trace minerals present at the time of formation give sapphires their color. Experts rate clarity by assessing the size, number, location, and visibility of the inclusions. For that reason, the best appearing stones are rated as eye-clean, meaning no inclusions are visible to the naked eye. But sapphires are known for their natural inclusions, making them slightly more susceptible to chips than a diamond with a 10 hardness grade.Īs for the inclusions in sapphires, they are a natural and expected feature of the gemstone. All sapphires are considered quite strong and durable, coming in at a 9 on the Mohs Hardness Scale.
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