If the necklace is pure gold, it is easy to break, because the higher the purity of gold, the softer it is, and the easier it is to break and deform.

18K is not easy to break. 750 platinum is not easy to break. The necklace is made of thousands of gold, which is very dangerous. You should go to a professional gold shop or necklace shop and ask them to add a safety thread, which is very thin and transparent. So they won't be lost because they are broken.