Alchemy by bacteria, via the Huffington Post:
Scientists have developed a bug which produces pure gold. The team at Michigan State University say that they found the bacteria Cupriavidus metallidurans is able to take gold chloride, a toxic chemical found in nature, and turn it into 24-karat gold.
“Microbial alchemy is what we’re doing – transforming gold from something that has no value into a solid, precious metal that’s valuable,” said Kazem Kashefi, assistant professor of microbiology and molecular genetics.
Unfortunately however the process isn’t particularly cost-effective meaning that it is more expensive to enact the conversion than the actual value of the gold produced.