Cat's-eye, any of several gemstones that, when cut en cabochon (in convex form, highly polished), display a luminous band reminiscent of the eye of a cat; this particular quality is termed chatoyancy.

A Cat's Eye stone brings self control and discipline to its wearer. Ketu is known as a shadow planet of astrological planets and is considered as descending node of the moon & due to its similar influences it is called a “second Mars”.