Deep mahogany red Tila beads with a blue mist swirl have been affixed to an adjustable antiqued bronze, base metal ring. Tila beads are smooth, flat glass beads.
The square is 20mm, or approx. 3/4 inch by 3/4 inch. The last picture shows an example next to a quarter to help gauge size.
The antiqued bronze brass ring is thin, and also adjustable to fit most adult sizes.