It sounded like stone when I tapped it on the cast iron stove to photograph it. It felt a little lighter than the current batch of dZi looking beads I bought recently in China but not as light as plastic. It was heavier feeling than the "resin" dZi beads I was shown by the bead dealers in Delhi.

The chips out of it do look different than chips out of stone. The wear from the cord would happen faster in plastic. Almost makes me wish I'd bought it so I could examine it more.