1. Islamic amulets must be authentic , means taken from Quran and the Prophet (SAWA) and Ahlul Bayt (AS). With out authenticity confirmed by trusted qualifies scholars, we can not call any amulet as Islamic amulet. Some people make their own fabricated amulets and claim it Islamic. Muslims need to be careful.
2. No doubt that having authentic Islamic amulets either by wearing or carrying or keeping at home or place of work is very useful and beneficial. Quranic verses tell us how the amulets are useful. The dress of Prophet Yousuf (AS), the remaining items from Aal Musa and Aal Haroon, the recitations of Jesus on the dead reviving him and on the seriously incurable illnesses resulting in cure, are just few examples.
3. Carrying Du'a Jawshan as a necklace is very useful as well as reading it.
Reciting the Du'a with sincere heart and attention has great benefits.