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PROBLEM TO BE SOLVED : To provide a bismuth-substituted rare earth iron garnet crystal substantially free from lead, which is considered to be very harmful, excellent in crystal characteristics, and capable of growing a crucible without damaging the crucible. SOLUTION : The bismuth-substituted rare earth iron garnet crystal further includes an element to become a divalent cation in addition to a composition represented by the composition formula : Bi3-xRxFe5-y-zM1yM2zO12(R : one or more elements selected from lanthanoid metals (excluding Eu) and Y; M1 : one or more elements selected from Ga, Al, Sc, Si, Ti, Sn and Zr; M2 : one or more elements selected from V and Nb; and 0.5COPYRIGHT : (C)2011, JPO&INPIT