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The present study is a result of an examination of synthetic red beryls recently produced in Russia. The standard gemmological properties correspond to the known range for synthetic beryls of Russian production. Chemical analyses showed distinct cobalt contents in addition to iron and manganese. Divalent cobalt dominates the absorption spectra and is responsible for the red colour. The low N a 2 0 concentrations are typical for synthetic beryls produced hydrothermally. An overall low alkali content can also be concluded from the IR spectra which showed a predominance of H 2 0-type I, i.e. water molecules not bound to alkali ions. Inhomogeneous growth structure formed a typical inclusion pattern.

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