Which lapis lazuli trade grade is characterized by green spots and noticeable calcite?

The Intense Medium Blue trade grade of lapis lazuli is identified by the presence of green spots and noticeable calcite inclusions. This grade typically has a vibrant blue color that is slightly less saturated than the Intense Royal Blue but richer than the Light Blue. The visible green spots and whitish calcite contribute to distinguishing this specific grade, which can affect its overall aesthetic appeal and market value. In contrast, grades like Intense Royal Blue would exhibit a more uniform, deep blue color without the same level of inclusions, and Light Blue would display a much lighter hue, making the characteristic features of the Intense Medium Blue grade more prominent and easily identifiable.