Nanoparticles with different shapes and sizes can be prepared by controlling the reaction conditions. The color of metal nanoparticles depends on the shape and size of the nanoparticles and dielectric constant of the surrounding medium.In this study we investigeted the influence of different parameters such as, type of silver precursor, reducing agent and protecting agent on stability and optical properties of silver nanoparticles. We have found that the silver precursor had an important effect on the crystallinity of the silver nanoparticles. When silver citrate was used as precursor of silver particles in aqueous solution, all the obtain colloids were stable in time in the investigated range. When silver nitrate or silver acetate was used as precursor of silver particles in investigeted conditions, silver particles were aggregated and precipitated from the solution.Silver nanoparticles prepared using different reducing agents had different morphologies and sizes. At the same concentration of silver in solution smaller silver particles were obtained using ascorbic acid as reducing agent than for strong reducing agents such as hydrazine or sodium borohydride. We found that the size of silver nanoparticles obtained in aqueous solutions using PVA as stabilizer did not depend on the concentration of silver in the range from 250-1000 mg/dm3 Ag. The particle sizes of the colloids were around 44 nm. Silver nanoparticles obtained in the aqueous solution using PVP as the protecting agent increased with the increase of silver amount from 36 nm for 250 mg/dm3 Ag to 82 nm for 1000 mg/dm3 Ag