Right so, in my story, my main character (a wizard) makes a living by conning Muggles into buying fake jewelery. Originally I was thinking he just conjured this jewelery out of thin air, but my beta pointed out that not even the witches and wizards have been able to make something out of nothing in the books. So I'm looking for suggestions as to how he might go about conjuring this jewelry. My plan was that he would conjure it and then it just disappears a few weeks later, with the Muggles simply believing they've lost it somewhere.
Would it be something as simple as he transfigures something worthless to look like a necklace, etc? Or a charm to make something like a glass necklace appear to be real diamond? I'm open to your most creative suggestions!