Marble pendants?

[glitterophelia.livejournal.com]

Okay, so a few weeks ago I was on the HGTV website and found an idea to make a pendant by putting art on the back of a marble (just like making marble magnets) and then turning it into a pendant for a necklace. I recently got an request from a customer who wants a custom made necklace with a particular photo as a pendant, and I'd like to show her the marble pendant idea (plus, I can't remember how they put the hook on it to hang it on the chain!) as an option. Only problem is, I can't find the article on HGTV anymore!

Does anyone have any links to photos of a pendant like this? And also, what could I do to put a hook on the back of a large marble pendant that will hold up to being on a necklace?

Alternatively, I know I could also put the photo on a silver pendant, but have been having troubles finding these locally. If anyone has any suggestions of where to find something like this online, I'd love to know about it! :)

(sorry there's no pictures in this post! )