Every thing I’ve ever read (fiction) about Djinn indicates that it’s never a good idea to make wishes with them. Either way, this article makes for an interesting read.
We’re all familiar with the idea of the genie (the bastardized Western version of the Djinn) appearing out of bottles to make sketchy deals with all too eager humans, but the use of jewellery and other worn accessories for magick and religious purposes dates back as far as 100,000 years ago, with artifacts appearing in places like Israel and Northern Africa.
Later on the Celts – whose recognizable design flourished across Europe through the Bronze and Iron ages beginning around 3,000 years ago – made it fashionable to wear designs like pentagrams and other pagan artwork to ward off evil spirits, or bring a good harvest to one’s village. Witches, during those pesky years where they were burned at the stake, undoubtedly hid most of their best stuff in the top drawer, similar to today’s traveling salesman leaving the wedding ring in the hotel before hitting the hotel bar.