You are looking at a Natural Spiny Oyster Shell cabochon (cab). The total weight is with a thin layer of backing. The penny is shown at 19mm for reference only. It was freeform cut and has a good shine.
| Gemstone Color | Purple |
| Gemstone Type | Shell |
| Gemstone Shape | Cabochon |
| Gemstone Creation | Natural |
What stands out about this unbranded piece is its unique, one-of-a-kind look.