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1.26CT EMERALD CUT MADAGASCAR SAPPHIRE, TEAL TO GREY, 5.7X4.79X4.44MM. Color shifting from teal in natural light to grey in indoor lighting. Great clarity. It is presumed to be heated, a permanent treatment for color and clarity.
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.