It's shape & color is like a Cat's eye. Colors of this stones are Yellowish, Blackish. Its a called Ketu's stone.
In colours it resembles the colour of the neem fruit, with silver streak. It also comes in other colours like black, black & white, yellow, pale blue and light red.
It clears obstacles hinderances and wards off evil effects of witch crafts. It can be profitably worn by politicians, who aspire for higher positions and authority. It is highly recomended for those, who do not have well placed Ketu in their natal charts. The malefic effects of Ketu is to cause loss of reputation and to increase jealousies and rivalries as a result of the person's popularity. Proper use of this stone will ease matters considerably and safe guard them from scandals and loss of reputation. It also gives the powers of strong determination to do things and is highly recommended for those having birth numbers 2 & 7, or those, who are governed by the planet Moon.
This stone, though inexpensive, has been tested and tried and is capable of relieving the tensions of the wearer, particularly for the fear of the impending hardships. It is good for those suffering from allergies or skin disorders. It can also be worn by those, whose Sun is debilitated in their natal charts or for persons of birth numbers 1 & 8. But they need to consult a good astro-numerologist.
This stone is highly recommended for those, who are in business. It protects the wearers against losses in business and ensures financial stability. Rich and wealthy persons can wear it as it will act not only as a guardian of its owner's wealth but will lead to further accumulation of riches. This stone works well if Kethu (Dragon's tail) be placed in 6, 8 or 12th from Venus in the natal chart. It gives comforts.
If Ketu (Dragon's tail) is in Lagna, use of this stone will prove to be beneficial. The stone acts as a guardian of the wealth of the wearer. It protects the wearer from all kinds of misfortunes. If the stone it is of a good quality, can take the person to top. It can cure ailments such as heart trouble, haemorrhage and increases knowledge, longevity and strength and cures otherwise chronic and incurable diseases. Even inexpensive gems can help in the solution of difficult cases.
Its colour is gold yellow, greenish white or urine colour. When seen in the light it resembles like the eye of a cat. It is useful in curing cancer. It is also effective for skin disorders, allergies etc. It can be helpful for general good luck in the case of persons who do not have well placed Kethu (Dragon's tail) in the natal chart.