Turquoise, the bluish-green stone, is very pleasing to the eyes that it has been ordained an official color in itself. It is an opaque stone, ranging from dark blue to bluish-green gem, but the intense blue is always in very high demand due to its holy powers. The color of the Turquoise stone has connections with the ocean water and the blue sky. It has the luster, which is typically waxy to sub-vitreous, and sometimes it could be semi-translucent in thin sections. The sky blue color of this stone represented heaven. In addition, the stone has ranged between five to six on the Mohs scale hardness.