Blue opal gemstone is one of the numerous assortments of opal stone that is accessible in shades of blue-green and blue. Once in a while, the expression “blue opal” likewise depicts the misty assortments of opal found in Machu Pichu, which for the most part has a greenish blue tone. In the event that you don’t know about the peculiarity known as the play of varieties, indeed, it is an optical impact due to which valuable opals show evolving shades. These evolving tints (or varieties) seem to drift inside the stone. This peculiarity makes blazes of orange, red, blue, and green tones. Normal opals, then again, exhibit an unpretentious optical deception known as opalescence.