Pennies are good for more than squashing on train tracks. Dutch designer Michiel Cornelissen likens them to “little industrial gems”—the perfect components for statement jewelry, in fact. His do-it-yourself coin necklace is a three-dimensionally printed bauble with slots for holding 111 5-cent euro coins, which are made of copper like American pennies were pre-1982. “Copper can oxidize and become darker over time, which can actually give a great look,” Cornelissen says. “If you prefer lighter, shinier coins, submerge them in vinegar for a few minutes. Stir well, rinse the coins in hot water, and dry them. It’s magic.”

+ Coin Necklace €55

+ Michiel Cornelissen

[Via MocoLoco]