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0.83CT ROUND BRILLIANT MONTANA SAPPHIRE, SOFT BLUE, 5.53X3.63MM. This sapphire is presumed to be heated, a permanent treatment for color and clarity. Sparkling blue-grey in natural light and shifts to a more greenish teal indoors. There is a small "freckle"/ black inclusion internally in this stone, hidden by the sparkle when seen from a regular distance.

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.