A jewelry alloy is disclosed preferably of 1 to 5 karat gold having the color, hue and shine characteristics of 10 or higher karat yellow gold. Although the alloy disclosed is virtually identical in appearance to 10 to 18 karat yellow gold, it is substantially less expensive and provides a relatively low cost substitute for higher karat yellow gold. The alloy has the following composition, by weight: Gold: 17-25% Silver: 10-27% Copper: 40-60% Zinc: 3-12% In addition to its appearance, the alloy disclosed has good corrosion and high tarnish resistance, good workability and castability and can be plated, if desired, and sized with conventional solders.

Coins or other value articles contain magnetic particles for changing the electromagnetic signature of the article and frustrate a counterfeiter's attempt to fake the article.

An improved sterling silver alloy. Like all sterlings, the improved alloy is at least 92.5 percent silver by weight. It has less copper than traditional sterlings: 3.0 percent versus the traditional 7.5 percent. Additionally, the improved alloy includes about 2.75 percent palladium, about 1.0 percent tin, and about 0.75 percent zinc, all by weight. A grain refiner, such as ruthenium, may also be provided. The components of the preferred alloy are melted, degassed, remelted, and then formed into casting grains, wire, and etc. The resulting alloy is significantly harder, as cast, than traditional sterlings: 95-120 Vickers versus 65 Vickers for traditional sterlings. The improved alloy also exhibits improved corrosion resistance. Other than a slightly higher (<200 F.) liquidus temperature, the improved alloy may be worked in substantially the same manner as traditional sterlings. Pieces cast from the improved alloy may be age hardened to about 160 Vickers, if desired.

A decorative item made from a moulded material having a density of between 2 and 7 g/cm.sup.3, wherein the moulded material includes by weight: 60 to 90% of a metallic or ceramic material having a density higher than or equal to 5 g/cm.sup.3, 10 to 32% of a plastic material including a thermoplastic resin and a coupling agent, 0 to 8% of a reinforcement, 0 to 3% of a pigment. Also, a method of manufacturing this decorative item by injection moulding.

The specification relates to a jewelry setting. The jewelry setting includes a gemstone having a culet; a mounting rod having a culet-shaped indent; and at least one braze joint, the at least one braze joint being formed between the culet and the culet-shaped indent.

A method of manufacturing yellow, red or white gold jewelry items layer by layer by selective laser melting (SLM) of a 18K, 14K, 10K or 9K gold powder alloy. The alloy comprises: (A) 37.5% to 38.5% by weight or 41.7% to 42.5% by weight or 58.5% to 59.5% by weight or 75% to 76% by weight of gold; and (D) 0.01% to 5% by weight, preferably 0.01% to 3% by weight of at least one metalloid, which may be germanium, silicon, boron, tellurium, phosphorous and selenium.

Metal alloys including platinum are disclosed. The alloys have a similar variety of applications to platinum-based alloys. The alloy with a solid solution matrix consisting of: Platinum (Pt) 20 to 70 at. %; Palladium (Pd)>0 to 70 at. %; Cobalt (Co)>0 to 50 at. % and at least one of: Nickel (Ni) up to 50 at. %; Chromium (Cr) up to 50 at. % and Iron up to 50 at. %.

Method of manufacturing a watch component (10) for a timepiece, wherein it comprises a first stage of manufacturing a watch component (10) comprising a first surface (1), in which there is arranged at least one recess (20), that is to say a surface recessed from the first surface (1), and wherein it comprises a second finishing stage the watch component, leading to a change in the surface condition, more particularly the roughness, more particularly measured by the parameters Ra and/or Str, and/or the gloss, of the first surface (1) but not of the at least one recess (20) or of a portion exclusively of this at least one recess (20).

A timepiece or piece of jewelry includes an alloy containing at least 750 wt.- gold, characterized in that the alloy comprises at least 200 copper, 19-35 palladium and 1-16 indium. Optionally, the alloy may contain at least one grain refining element, and also optionally, the alloy may contain at least one element selected from the group consisting of Ca, Sr, Si, Zr, and Mg.

A discoloration resistant Gold alloy for jewelry characterized in that it comprises in weight: Gold, in the amount comprised between 755 and 770, Copper, in the amount comprised between 165 and 183, Silver, in the amount comprised between 28 and 50, Palladium, in the amount comprised between 19 and 23 and Iron, in the amount comprised between 2 and 6.
and characterized by the absence of Vanadium.