This paper investigates the incorporation of silver into borosilicate nuclear glasses, focusing on the effects of glass composition and melting temperature. Results demonstrate that the iron-content and thermal history of the glass are two parameters that influence the oxidation state of silver and therefore its incorporation into the glass matrix. This study shows that in glasses melted under oxidized conditions, silver is primarily dissolved in the glass matrix under its Ag+ form. However, high iron-contents and high melting temperatures promote the precipitation, during the glass cooling, of a small proportion of the silver as Ag0-particles. In glasses containing platinoids (Ru, Pd), a minority fraction of silver tends to precipitate in its reduced form Ag0, along with the Pd-Te alloy even for low iron-contents. This fraction also depends on iron-content.