I have a natural round ruby sterling silver slide pendant like this one.

Well, maybe not exactly like this one, the shape is a little different. I like to have a mix of simple pendants in my jewelry collection.

I don't know how it happened but the ruby fell out of its cavity and the inner part of the stone is chipped. 

My sis suggested that I glue it back but I suspect it is not that simple. there seems to be something that is supposed to hold the ruby in its place and that is a mark as if something has broken off.

Besides, if the glue work is not very good, I may leave ugly marks or the stone may fall off again and I may not be second time lucky to recover the stone.

I'll ask around the jewelry shops to see what they can do. Or I'll just have to buy another one, maybe from this website.