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Living cells of Chlorella vulgaris Beijer. strain A10 are capable of effectively concentrating trivalent gold added to the medium in the form of tetrachloraurat. The amounts of Au (III) accumulation in growing and resting cells are similar, many times higher than in dead cells, and range up to about 70 % of dry biomass. Kinetic curves of the process testify that time of reaching equilibrium in living and dead cells should be practically the same, about 15 minutes. The quantity of gold accumulated by cells depends on concentration of interacting compounds. It linearly rises as the concentration of Au (III) in the medium increases, at least up to 50 mg Au/L (at constant concentration of cells of 60 mg/L or higher) and peaks on increase of cells concentration (at constant concentration of gold). Au (III) concentration by cells may be artificially regulated by physical (light) and chemical (modificators of energetic metabolism) factors. Cells are able to release the gold into the medium after addition of certain metabolic inhibitors and placing the vessel with cells in darkness.