"It is regarded by some nations as a sacred stone used as a charm against witchcraft.” – Mani Mala, Part I, pg. 269.

The  gemstone for Ketu is Chrysoberyl Cat’s Eye. The finest quality stones  are lemony, yellow, often referred to as "milk and honey." The outer  part of the stone is honey in color, the inner eye is whitish, milk-like  color, which flashes as the stone is turned. Darker varieties are not  generally as powerful. Dark or any black imperfections are to be  strictly avoided. It is known that wearing a stone with dark  imperfections can cause early demise or bad luck, as many ancient texts  do state.

Chrysoberyl Cat's Eye has been known to increase powers  of psychic abilities and clairvoyance. It also has the ability to bring  spiritual awareness, if the individual's chart indicates these  tendencies.

It was believed by the ancients that Chrysoberyl  Cat’s Eye protected the wearer from diseases, epidemics, drowning,  negative spiritual attachments and harm from enemies.

Gamblers and sportsmen have claimed it can bring greater intuition and luck in gaming.

Because  Chrysoberyl Cat’s Eye amplifies the Ketu energy, it is critical that  great caution is taken before wearing Chrysoberyl Cat’s Eye. It is  important that a competent Vedic Planetary Gemologist examine the chart  of the wearer, as Ketu is considered a malefic (bad) planet and wearing  Chrysoberyl Cat’s Eye strengthens Ketu. Therefore, if Ketu is  maleficly-placed or aspected in the astrological chart, it can magnify  problems for the persons who wear it without proper prescription.

The source countries are India, Burma, Sri Lanka and Brazil.
Substitute Gems
Apatite Cat's Eye may be a less costly substitute for Chrysoberyl Cat's Eye, although its effects are less powerful.
Ketu Planetary Mantra = Om Kem Keteve Namaha (ohm kame kaytevay nahmahhah)

Call  for a consultation on a design for an astral talisman which can  noticeably improve your energy and life. I provide natural, untreated  gemstones suitable for gem prescriptions.