Fordite

The masses consist of automotive paint which has hardened sufficiently to be cut and polished.

Fordite is notable for the way it displays "the history of the American automotive industry," both to illustrate the changing colors of car paint as well as the transformation and disappearance of the Ford Motor Company factories in Detroit.

[2] Gems & Gemology claims fordite "was first collected at Ford Motor Company in Michigan in the 1940s.

The electrostatic process "magnetizes the enamels to the car bodies," reducing or eradicating overspray.

[2] This has led to restrictions on selling fordite jewelry in states such as California which have strict regulations on toxic substances.