Unique bayonet interchangeable clasp with ruby heart, mother-of-pearl and diamonds

Unique bayonet changing clasp with heart chaped ruby, mother of pearl and brilliant-cut diamonds totalling ca. 0.36 ct, good colour and clarity, elaborate craftsmanship made of 18K white gold, 32 g, D: 4,2 cm, choker made of many rows of black material with steel ends, L: 42.5 cm, 20th/21st century, very good condition, marked H.Jaufmann (Augsburg).