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Stoichiometry deviations in aluminium and gallium garnet crystals are investigated by measuring the spectra of rare‐earth impurities ions as indicator. All garnet crystals prepared from the melt are found to have a nonstoichometric composition due to incorporation of some part of the rare‐earth ions into Al3± or Ga3± octahedral sites. The stoichiometry deviations in the homologous series of aluminium and gallium garnet crystals are estimated quantitatively. The spectra of Er3± ions occupying a‐sites with octahedral oxygen environment in garnet lattice are registered and studied. An effect is found of difference in the sizes of the rare‐earth ions on their co‐occupation of octahedral sites in the gallium garnet lattice.

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