The outer ring of each chromastone is made from premium brass, an alloy of zinc and copper.

Humans and brass have been in conversation with each other for thousands of years, and they share a rich material and medicinal history. Brass was one of the first metals used to create jewelry, musical instruments, utensils, and religious artifacts, as well as in architecture and art in some cultures.

Brass is highly conductive of heat and possesses antimicrobial properties. It's valued in folkloric traditions to improve circulation, relieve pain and inflammation, and boost the immune system. According to some African and Indian traditions, brass amulets can protect the wearer from evil spirits. Some cultures also believe brass to have aphrodisiac properties which can increase fertility.