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1.36CT EMERALD CUT MONTANA SAPPHIRE, BLUE, 6.6X4.9MM (HEATED). This sapphire was cut and mined in the U.S.A. It features what we call "watercolor" streaks of varied shades of color within the body of the stone. Medium ocean blue color and precision emerald cut. This stone has been 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.