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1.40ct NIGERIAN OVAL SAPPHIRE, COBALT BLUE, 7.38X6.15X3.96MM, UNTREATED. Some white inclusions in this stone, one reaching the surface (that spot is not visible to the naked eye but through magnification). The lighter white inclusions are visible to the naked eye. Totally natural/untreated with a vibrant cobalt and royal blue.

About Heat Treatments: Some colored gemstones are routinely heated for color and clarity improvement. This is a permanent treatment and typically only involves heat and not chemicals. The treatment mimics what the earth does naturally to gemstones as they reach the surface. If the stone says "Unheated," it is not treated in any way.