This item is a free form off set rectangle Blue turquoise. The dimensions are 16 millimeters by 23 mm by 3 mm deep. This turquoise weighs 10.5 ct. This stone is flat on top and is backed with Black Jade. It is well-made and beautiful teal blue color. I suspect the material is from the morenci mine. It is natural material and is not treated in any way. The size and shape of this gemstone would lend itself to pendant design. Gorgeous gemstone.