A Gold alloy for jewelry, comprising: Gold: in the amount comprised between 780‰ and 840‰ in weight; Copper: in the amount comprised between 125‰ and 167‰ in weight; Silver: in the amount comprised between 15‰ and 54‰ in weight; Platinum or Palladium, wherein the content of Palladium or Platinum is such that the assembly of Gold, Copper, Silver and Platinum or Gold, Copper, Silver and Palladium reaches a percentage at least equal to 980‰, and more preferably the 1000‰ in weight of the alloy;
and wherein the so composed Gold alloy shows, under the conditions referred to in the ISO DIS 8654:2017 standard, a color compatible with the 5N alloy color standard.

A component suitable for a timepiece or a jewellery item may be made of a cermet material including a carbide phase and a metal binder phase selected from among gold, platinum, palladium rhodium, osmium, ruthenium, and one of the alloys thereof. The metal binder phase may be present in a range of from 3 and 25 wt. % and the carbide phase may be present in a range of from 75 and 97 wt. %.

A decorative piece includes a support made of a material having no usable plastic deformation in which at least one hollow is arranged. The hollow is filled with a first material forming a substrate in which at least one housing is arranged. The housing is arranged so that at least one aesthetic element is housable therein. The substrate further includes a gripper elastically deforming to retain the aesthetic element in the housing. The gripper further includes at least one setting element. A method for setting an aesthetic element on a support includes taking a support provided with at least one hollow, taking at least one aesthetic element, filling the hollow with a first material, making a setting hole and a gripper in the first material, and setting the aesthetic element by placing it in the hole and by deforming the gripper so as to retain the aesthetic element.

A gold alloy including, by weight, between 73% and 77% gold, between 20% and 24.5% silver, palladium and/or platinum with a total percentage for these two elements between 0.5% and 5%. With the addition of palladium and/or platinum, this alloy has an enhanced tarnishing resistance while having a green tint.

Provided are a silver article formed using pure silver, which has high Vickers hardness and prohibits the occurrence of metal corrosion and the occurrence of discoloration; and its method. Disclosed are a silver article and its method, wherein the Vickers hardness is adjusted to 60 HV or higher, and when the height of the peak of 2θ=38°±0.2° by an XRD is designated as h1, and that of 2θ=44°±0.4° is designated as h2, h2/h1 is adjusted to 0.2 or greater.

A piece of jewelry having a copper-containing gold alloy consists of 58.5 to 58.7 wt. % gold, 26.9 to 32.6 wt. % copper, 5.7 to 10.7 wt. % silver, 1.0 to 3.0 wt. % palladium, and a remainder containing 0.7 to 2.2 wt. % zinc.

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 platinum alloy composition consisting, in weight percent, of: 0.0 to 10.0 gold, 0.0 to 5.0 cobalt, 0.0 to 10.0 copper, 0.0 to 7.0 iron, 0.0 to 4.0 gallium, 0.0 to 3.0 indium, 0.0 to 5.0 iridium, 0.0 to 10.0 manganese, 0.0 to 7.0 nickel, 0.0 to 15.0 palladium, 0.0 to 5.0 rhenium, 0.0 to 5.0 rhodium, 0.0 to 10.0 ruthenium, 0.0 to 3.0 tin, 85.0 or more platinum and incidental impurities, wherein two or more of gallium, indium and tin are present in an amount of 0.1 or more, wherein the following equation is satisfied in which W.sub.co, W.sub.Cu, W.sub.Fe, W.sub.Ga, W.sub.In, W.sub.Ni, W.sub.Pd, W.sub.Sn, W.sub.Rh, W.sub.Ir, W.sub.Au, W.sub.Ru, W.sub.Re, and W.sub.Mn are the weight percent of cobalt, copper, iron, gallium, indium, nickel, palladium, tin, rhodium, iridium, gold, ruthenium, rhenium, and manganese in the alloy respectively 60+W.sub.Pd*2.5+W.sub.Rh*3.4+W.sub.Ir*6.455+W.sub.Au*11.93+W.sub.Ru*13.241+W.sub.Cu*14.328+W.sub.Re*16.6+W.sub.Ni*16.9+W.sub.Mn*18.48+W.sub.Co*18.69+W.sub.Fe*21.879+W.sub.In*29+W.sub.Sn*28.207+W.sub.Ga*42.379≥150 and wherein one of the following conditions is satisfied in which W.sub.Co, W.sub.Cu, W.sub.Fe, W.sub.Ga, W.sub.In, W.sub.Ni, W.sub.Pd, W.sub.Sn, W.sub.Mn, W.sub.Ru, W.sub.Ir, W.sub.Rh, W.sub.Au, W.sub.Pt and W.sub.Re are the weight percent of cobalt, copper, iron, gallium, indium, nickel, palladium, tin, manganese, ruthenium, iridium, rhodium, gold, platinum and rhenium in the alloy respectively −0.1028*W.sub.Co−0.1201*W.sub.Cu−0.2113*W.sub.Fe−0.3368*W.sub.Ga−0.1125*W.sub.In−0.1639*W.sub.Ni−0.015*W.sub.Pd−0.1959*W.sub.Sn+17.276261−0.20*W.sub.Mn+0.0678*W.sub.Ru+0.035*W.sub.Ir+0.045*W.sub.Rh−0.059*W.sub.Au+0.066*W.sub.Re≤16.0 when W.sub.Pt<95.0 and −0.1028*W.sub.Co−0.1201*W.sub.Cu−0.2113*W.sub.Fe−0.3368*W.sub.Ga−0.1125*W.sub.In−0.1639*W.sub.Ni−0.015*W.sub.Pd−0.1959*W.sub.Sn+17.276261−0.20*W.sub.Mn+0.0678*W.sub.Ru+0.035*W.sub.Ir+0.045*W.sub.Rh−0.059*W.sub.Au+0.066*W.sub.Re≤16.6 when W.sub.Pt≥95.0 and wherein the following equations are satisfied in which W.sub.Co, W.sub.Cu, W.sub.Fe, W.sub.Ga, W.sub.In, W.sub.Ni, W.sub.Pd, W.sub.Sn, and W.sub.Au are the weight percent of cobalt, copper, iron, gallium, indium, nickel, palladium, tin, and gold in the alloy 0.35 W.sub.Au+0.6 W.sub.Sn+0.6 W.sub.In+W.sub.Ga≤3.75 W.sub.Co+W.sub.Pd+W.sub.Fe+W.sub.Ni+W.sub.Cu≥1.0 W.sub.Sn+W.sub.In+W.sub.Ga≥0.25.

A zinc-free gold alloy containing by weight between 37% and 38.5% of gold, between 4 and 32% of palladium and/or silver, between 25% and 54% of copper and between 0% and 10% of gallium. A timepiece or piece of jewellery or gemstone jewellery made of this alloy.

To provide a decorative member having a cherry blossom pink color. A cherry blossom pink decorative member of the present invention includes a base and a decorative coating formed on the base, wherein the decorative coating is formed by layering an undercoat layer and a finishing layer from the base side, the undercoat layer is a carbonitride layer composed of a carbonitride of a metal containing Ti and at least one selected from Nb and Ta, and the finishing layer is a Au alloy layer composed of an alloy containing Au, a metal having a silver color, and Cu.