A mold was made from microscope pieces in a silicone mold making rubber (product called Oomoo) and then cast in resin. The concrete portion of the bracelet was made from a wood version (with all holes for screw and bolt locations drilled) that was molded and cast in concrete. The concrete was then filed and sanded smooth at the edge that was exposed from the top of the mold.
The nickel portion of the bracelet was made from 22 gauge nickel sheet, which was etched using ferric chloride and PnP Blue as a resist (which a pattern was laser printed, and heat transferred onto the metal sheet). The nickel sheet was put in a hydraulic press with a form made from acrylic. After the sheet was formed, it was cut and bolted onto the concrete piece. The resin microscope pieces were screwed into the bracelet and the nickel sheet hides all the screw tops.