That's quite and odd concept. I like the idea of gemstones made from ashes, and I think that's something I'd consider. But I don't like the idea of it in a pillow, that's not for me. I don't like the idea of an urn either though. Jack is buried in the garden and has his memorial stone and rose, and that's the way I like it. Jack is gone, he's not in the garden only his bones now, but he was laid to rest there and that satisfies me. All that's left of him are my memories and photographs and videos, and I think that's the best way to remember your cat or any other pet for that matter.