If the bead necklace of 18k is very thin (for example, about 0.8mm, 0.35 g), it is definitely not strong, and it will break with a light pull. Because its gold content is only 75%, other metals are added, which greatly improves the hardness. When wearing 18k bead chain necklace, be careful not to pull it. If the weight is small and it is not properly worn, it will break down. If you want a strong bead chain of 18k, it is recommended to buy a slightly thicker one (for example, 1.2mm or more, 1g or more).

18k gold is an alloy with a gold content of at least 75%, that is, an alloy with a gold content of 18/24, and the remaining 25% is other precious metals, including platinum, nickel, silver and palladium. 18K gold is a kind of gold ornament with low cost and comfortable wearing. The calculation method of K gold is to divide pure gold into 24 parts, and 24k gold is pure gold, but in reality, it is impossible to have 100% gold, so China stipulates that gold with a content of more than 99.6% can be called 24K gold.