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Polyextremophilic red algae, which belong to the class <i>Cyanidiophyceae</i>, are adapted to live in geothermal and volcanic sites. These sites often have very high concentrations of heavy and precious metals. In this study, we assessed the capacity of three strains of <i>Galdieria</i> (<i>G. maxima</i>, <i>G. sulphuraria</i>, and <i>G. phlegrea</i>) and one strain of <i>Cyanidium</i><i>caldarium</i> to tolerate different concentrations of precious metals, such as palladium (Cl₄K₂Pd) and gold (AuCl₄K) by monitoring algal growths in cultures exposed to metals, and we investigated the algae potential oxidative stress induced by the metals. This work provides further understanding of metals responses in the <i>Cyanidiophyceae</i>, as this taxonomic class is developed as a biological refinement tool.