Nothing. The ones I had were two different colors: teal milky and gray. However, they are translucent plastic and I wanted to use them for a craft demonstration. I sent them back because they look cheap and don't fit what I want them for. The middle one looks a lot more natural so I'll use that. If you need something for a pet, then it will do, but it does not look like a stone at all, as shown in the photo. Just be prepared for a variety of colors and this is made of a transparent material.
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