Различные бирюзовые камни выставлены на темной поверхности. Камни различаются по форме. Various turquoise stones are displayed on a dark surface. The stones vary in shape and cut, with some polished into smooth, geometric forms while others remain in their natural, rough state. The bright blue-green color with black veining is typical of turquoise, a phosphate mineral used in jewelry and decorative arts. Turquoise, scientifically known as CuAl? (PO? )? (OH)? ·4H? O, is prized for its beauty and is often found in arid regions around the world, including the southwestern United States, Iran, and China.