A process of manufacturing a piece of jewelry by drilling holes through a piece of metal form a back surface thereon, forming a seat within each drilled hole, resting a peripheral surface of a crown side of a stone on each seat, forming partially drilled holes into a front surface of the piece of metal and setting a cutlet side of a stone into the partially drilled holes such that the crowns of the stones are viewable at different heights from the front surface of the piece of jewelry, and a piece of jewelry formed by the same process.

The present invention relates to a process for manufacturing a mechanical part based on at least two precious or noble metals or alloys thereof, the process comprising a step of atomizing the various precious metals, positioning the resulting powders in a mold so as to form an assembly of unmixed powders, and a step of sintering at temperatures below the melting temperatures of the metals used. The invention also covers a mechanical part produced by such a process, as well as a timepiece comprising such a mechanical part.

A method of joining titanium and precious metal, the method comprising the steps of: a) providing a titanium pin or tube; b) providing a mold having a brass insert, c) placing the shaft of the pin or tube through the brass insert and into a corresponding hole in mold; e) closing the mold; f) injecting plastic into the mold and forming at least one plastic branch; g) forming a complete product using the lost wax method of casting. A metal composite comprising: a) a precious metal body portion; and b) a cylindrical titanium portion having a shaft portion and a head portion, wherein the head portion is embedded within the precious metal body. A mold used to join titanium and precious metal, the mold comprising two halves and a brass insert.