Another stone

I couldn't and didn't take a picture of each stone. It was so overwhelming, so powerful, that I just snapped pictures of what grabbed at me. I didn't even get whose name this stone was placed for, in this picture. Also, right below the white votive candle can be seen a prism-like object. These are placed one on each stone. They remind me of old fashioned doorknobs or drawer pulls. If anyone can tell me what these are, exactly, I'd very much appreciate it.