Snap and comb buttons. Van Cleef & Arpels necklaces generally have two kinds of buttons. The first type is the snap type. Snap-on design is simple and practical, and it is convenient to put on and take off. The second type is comb buckle. Comb buttons are generally used on complex and layered necklaces. Comb buttons are usually designed by combining gems or jewels with combs, which makes the buttons more beautiful and ensures the comfort and wearing stability of necklaces.