Abstract: A watch housing has a mechanism carrier, an upper part and a base part which are installed on the mechanism carrier by screws which directly connect the upper part and the base part. Furthermore, sealing members are provided in order to make the watch housing water-tight. The design freedom for the watch housing is improved in advantageous manner by designing the mechanism carrier as a support element and also the upper and base parts as shells.

Abstract: A gemstone, on which respectively at least four facets of equal size have been cut in the upper part and the lower part above and below the girdle plane, which have a parallel base edge, wherein the angle (.alpha.) between an upper part facet (20 . . . 23) and the girdle plane is less than the angle (.beta.) between a lower part facet (10 . . . 13) and the girdle plane. Between the lateral edges of the lower part facets (10, 11, 12, 13) one group (40 . . . 43) of narrow, triangular additional facets, which extend fan-like from a girdle plane, is provided. The narrow sides of the one group of additional facets meet in the connecting lines between the tips of the lower part facets (10, 11, 12, 13) and the narrow sides of the additional facets of a respectively neighboring group.

Abstract: A plug-type clasp for pieces of jewerly, in particular for necklaces, composed of a housing in which a sleeve is movable under the force of a spring. The sleeve has a receiving opening into which a connecting element can be inserted through a front-end opening of the housing and locked there. Both the front-end opening of the housing and the receiving opening of the sleeve are eccentrically offset from each other, so that the connecting element can only be inserted into the housing, and locked there, only after the sleeve has been pulled back against the force of the spring. Removal of the connecting part can take place in the correspondingly reversed order. Activation of the sleeve for unlocking the plug-type clasp takes place by means of an operating button, laterally guided in a longitudinal hole of the housing, so that the actual connecting areas of the plug-type clasp for pieces of jewelry, in particular necklaces, remain free of pulling stresses during the operation of the plug-type clasp.

Abstract: A gem setting includes a holding body and a gem received therein in a predetermined position, an inner wall face forming a part of the holding body and defining a bore hole therein; a first depression in the inner wall face; and a second depression in a peripheral face of the gem. The peripheral face is received in the bore hole and the first and second depressions are in alignment with one another in the predetermined position of the gem. An elastic connecting member is nested simultaneously in both the first and second depressions for coupling the gem to the holding body. The elastic connecting member and the depth of one of the depressions is dimensioned with respect to one another such that the elastic connecting member is expandable into the depression during introduction of the gem into the bore hole until the first and second depressions arrive in mutual alignment with one another.