Abstract: A high tarnish resistant silver alloy composition formulated for jewelry and flatware manufacture is provided. In certain implementations, the alloy contains about 92%-97% by weight silver, about 0.25%-3.5% by weight palladium, about 0%-3.5% by weight platinum, about 0%-2.5% by weight gold, about 0.1%-1.0% by weight copper, about 0.5%-3.5% by weight zinc, about 0.1%-1.5% by weight tin, about 0.25%-1.5% by weight indium, about 0.03%-1.1% by weight silicon, about 0%-0.5% by weight germanium, about 0.15%-0.5% by weight gallium, about 0.25%-0.5% by weight cobalt and about 0%-0.5% by weight ruthenium. These unique combinations of elements result in the alloys with the tarnish resistance superior to typical 10K gold alloy.

Abstract: A silver-palladium alloy formulated to provide an alloy with a whiter color and superior casting and fabrication properties as compared to nickel-based white gold and also to impart to an article of jewelry or the like favorable properties afforded by white gold. The alloy generally includes silver and palladium, with silver being the predominant component. In some embodiments, the alloy contains about 75%-85% silver and about 5%-15% palladium by weight.

Abstract: A silver-platinum alloy formulated to provide improved tarnish resistance and hardness as compared to sterling silver. The alloy can be incorporated in various jewelry, flatware, and like articles. The alloy generally includes silver and platinum, with silver being the predominant component. In certain applications, the alloy includes about 90–95.5% silver and about 0.5–6% platinum. A small amount of gallium can also be added to the composition to provide ease of manufacture of the alloy. The resulting alloy has the favorable properties afforded by sterling silver, but also has brighter surface finish, greater tarnish resistance and increased hardness as compared to traditional sterling silver.