Hi Saket, I hope you are talking about 1 mukhi chandrakar. 1 mukhi chandrakar rudraksha are like half moon shape and resembles to original 1 mukhi round rudraksha in power. These chandrakar beads when broken ( on the single line on the top), there we find one hollow compartment where there exists one seed. The power of the rudraksha bead is because of these seeds and in 1 mukhi there will be one seed giving the power.
If the top of the bead is chipped, it will have opening to the inner compartment and will have lesser power. Power will still exist with the bead. But better to change the bead.
In case you are talking about 1 mukhi round rudraksha, then also there will be some power and you can continue to wear. But better to change the bead if possible. Otherwise continue how you feel after wearing.
Saket, Many of the grown and proper beads which may have grown fully, have small cracks at the top face. Those cracks are natural and that much small cracks are ok.
1 mukhi works properly when worn with 5 mukhi rudraksha. The effect of 1 mukhi rudraksha is enhanced and gives more better results and known as personal power mala. Go ahead and wear 5 mukhi along with 1 mukhi rudraksha.
And wear the beads in odd numbers like 3 beads. So with one 1 mukhi rudraksha, add two 5 mukhi rudraksha and make mala.