Fordite is sometimes call Detroit agate. It is paint from pre 1972. From Ford motor company. Each color is a different car, the layers built up on the pipes & walls of the paint booths. The workers had to shave it off after so much time, it was tossed into dumps. Some of the workers took chunks of it home & now it has been discovered by jewelers. It is cut and shaped for designs in jewelry. Mainly set into sterling silver, as these are. Never s pieces alike, so our pairs of earrings do not really match! Overall size is about 2″ x 1/4″ very light weight to wear.