*2.1. The Three-Eye Dzi Bead*

The three-eye bead investigated in this work was purchased in a jewelry store in Chengdu, Sichuan, China, and it came with an authenticity certificate (Figure S1). The bead was sliced in the middle, as shown in Figure S2. Slicing was carried out in the Department of Earth Sciences at Western University. A MK Diamond brand tile saw with a diamond embedded blade was used to slice the Dzi bead into several pieces. The bead was cut open to reveal the interior for further imaging. It should be noted that the middle piece was chipped, which is not unexpected from a hard stone like agate. A small piece was ground to power. Both the slices and the powder specimens were used for XRD measurements.
