Is it true that it is bad luck to wear the claddagh ring on your left hand if you are not married?

I have never heard that superstition.
If you are married or engaged tradition states that you wear the ring with the heart pointing up the arm and if you are single the heart is out.

I’m not familiar with that particular superstition but I have always been taught that it is very bad luck to buy the claddagh for yourself – that it should always be given as a token of friendship.

Bad luck is just superstition it is not to , you should also belive in jesus and god because they stop bad luck .