Tarnishing resistant Gold alloy for jewellery, comprising: - Gold in the amount comprised in the range [815-846] %o by weight, - Copper in the amount comprised in the range [120-154] %o by weight, - Silver in the amount comprised in the range [18-35] %o by weight - Platinum in the amount comprised in the range [1-10] %o by weight, - Palladium in the amount comprised in the range [7-15] %o by weight, wherein the Gold alloy is a quinary alloy, and wherein the Gold alloy so composed shows, under the conditions set forth in ISO DIS 8654:2017 standard, a color compatible with the 5N alloy color standard.