Chalcedony jewelry inlaid with 18K gold. 18K gold refers to gold with a gold content of 75%. 18K gold chalcedony refers to chalcedony jewelry inlaid with 18K gold. Due to the addition of different metals, such as brass and silver. So in terms of color, three different colors are used: gold, platinum and rose gold. Chalcedony refers to a kind of timely rock, which has different colors such as white, pink and red. The cost and price are very cheap.