Mala (rosary) used for counting (chanting) mantras dedicated
to Shani Bhagvan is usually made Black Hakik stone (agate stone). Black is the
color associated with Shani. Those suffering from bad position of Shani in
horoscope and Sade Sati get relief by chanting Shani mantras using Mala made of
Black Hakik stone.
Another mala that is used for chanting mantra is the mala
made from Vaijanti stone. This is also recommended for chanting Shani mantras.
Those people who follow and believe in astrology are of the
view that for getting good benefit of mantras one should use malas associated
with the particular deity.
Thus for Shani mantras the first choice is Black Hakik Stone
mala.