PURPOSE: To improve the hardness of a silver allay without losing the excellent characteristics of silver, to prevent the generation of flaws in the process of working or the like and the damage of the product in the use and to facilitate the working by adding specified amounts of Ge and Ti to a silver alloy contg. specified amounts of copper and Ni.

CONSTITUTION: This silver alloy is formed by adding, by weight, >l to 5% Ge and/or 0.01 to 5% Ti to the elements constituted of >l to <18% Cu and >1 to 5% Ni and the balance <97% Ag. In this allay, as for Cu, the lower limit or above is required for increasing the hardness by precipitation hardening and for increasing the work hardenability, and in the case of more than the upper limit, these functions are lost and the melting castability deteriorates. As for Ni, the lower limit or above is required for increasing the hardness at the time of casting and for refining the crystals, and in the case of more than the upper limit, the melting castability deteriorates and its characteristics are made unstable by segregation. As for Ge, the lower limit or above is required for improving the selectivity of the melting castability and for increasing the work hardenability, and in the case of more than the upper limit, the workability deteriorates and the refining of the crystals is suppressed. As for Ti, the lower limit or above is required for promoting the work hardenability and precipitation hardenability, and in the case of more than the upper limit, the workability and melting castability deteriorate.