Product made of C-shaped fossilized mollusc shell. It is likely, previously had the shape of a ring with a wide hole in the center of the product. The item is broken.
Krivoshapkin, A., Shalagina, A., Baumann, M., Shnaider, S., & Kolobova, K. Between Denisovans and Neanderthals: Strashnaya Cave in the Altai Mountains. Antiquity, 92(365). P. 2., Figure 4.3 https://doi.org/10.15184/AQY.2018.221