The placer gold in Korean jewelry is real. Placer gold itself is a kind of gold. Placer gold has a low gold content, which is about 5%. What is seen in China is pure gold with a gold content of 99.9%. Gold produced at the bottom of the river or in low-lying areas, mixed with stones and sand, was washed out. Placer gold mines originated from mines. Because gold ore is exposed to the ground, after a long period of wind and rain, rocks are weathered and cracked, and gold is separated from veins with sediments, which naturally precipitate in sand and deposit in river bottom or sand as a gold-bearing layer, thus forming placer gold mines. The characteristics of placer gold are: the particle size is different, the big one is like broad bean, the small one is like fine sand, and the shape is different. The color varies with the fineness. More than 90% is red and yellow, eight is light yellow and seven is cyan yellow.