Crystal singing bowls are made of pure quartz (essentially 99.9% silicon quartz) and sand in a spinning mold, in a process that heats the mixture to about 3500 degrees.
Crystal singing bowls are clear or frosted and are made in a variety of sizes ranging from 7 to 20 inches. During the manufacturing process, crystal bowls are designed to create specific sounds using digital technology, depending on individual needs. When played simultaneously, some bowls harmonize with each other.