M button, mainly opened and closed by hand, can be directly inserted into the other end of the necklace, and is mostly used on metal necklaces with good ductility; Spring buckle, which needs to be controlled by a mechanism with a spring, is mainly used on slender and delicate necklaces; The hidden buckle needs to be fixed by clamping the spring into the groove, which can be made hollow or inlaid with gems.

M button If the button on the necklace is an M button, it can be opened and closed mainly by hand, and the other end of the necklace is directly inserted. Because M-buttons need to be opened and closed frequently, they are often used on malleable metal necklaces such as gold and platinum, and can withstand multiple opening and closing.

Spring button If the button on the necklace is a spring button, it is necessary to control the opening and closing of the connecting button through a mechanism equipped with a spring, which is convenient to wear. This kind of necklace buckle is the most common in daily life, and it is mainly used for slender and delicate necklaces, but be careful when using it.

Concealed button If the button on the necklace is concealed button, it should be fixed by the spring clip into the groove, and its shape is also quite decorative. It can be hollowed out or inlaid with a gem, which is full of creativity and generally appears in all kinds of big-name and high-end jewelry.