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1.04CT PRECISION CUT OVAL MONTANA SAPPHIRE, MINTY LIGHT GREEN YELLOW, 6X5MM. Mined in Rock Creek, Montana, USA. Will shift in color from more minty blue in natural light and more green with yellow flashes indoors. This sapphire 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.