"Customers don't realize that one wedding ring weighs 10 grams and causes three tonnes of toxic waste," says Greg Valerio, whose company aims to follow fair trade coffee with ethical gold jewelry.

A silver-haired anti-poverty and human rights campaigner, Valerio is at the forefront of a fast-growing global market for gold and platinum jewelry which seeks to soothe consumers' consciences and protect miners from danger and exploitation.

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