It is permissible to wear them without any belief in them!

To believe that these gem stones have properties and can help you or harm you in anyway, it is Shirk, minor or major!

I advice you to read the below link: http://islamqa.info/en/6759

Is wearing Gem stones allowed in Islam?

Q&A / Fatwas, Shirk and its different forms | May 25, 2014 6:05 pm
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Sheikh I want to ask if person is watching TV at the time of salaah in mosque.and then he prays later at home.Will his salaah be acceptable?