Typical 18-karat gold is an alloy of 75% gold and 25% of one or more other metals, such as copper or silver. This miraculous nugget uses plastics instead of metal for that 25%.

18-karat gold isn’t pure gold, it is defined as being 75% gold by weight. The remaining 25% of the mix is usually made up of one or more other metals, with silver and copper popular choices.

Researchers have created an incredibly lightweight 18-carat gold, using a matrix of plastic in place of metallic alloy elements. Lovers of gold watches and heavy jewellery will be thrilled. The ...

Conventional 18-karat yellow gold is made from 75% gold and 25% other metals, such as copper, silver, and platinum. Because of the gold’s rarity and high price, manufacturers are always exploring ways ...