Unique bayonet interchangeable clasp with square rock crystal

Unique bayonet changing clasp with rock crystal square 2x2 cm (bottom as pyramide) and 14 small brilliant-cut diamonds set in bows underneath, very massiv construction made of 18K white gold, 35.5 g, with necklace made of rubber and ends of 18K yellow gold, L: 44 cm, 20th/21st century, minor signs of wear, marked H.Jaufmann (Augsburg).