Studies of the g factors of the ground 4A2 and the first excited 2E state of Cr3+ ions in emerald

► The ZFS and g factors of ground and the first exited states of emerald are interpreted theoretically. ► The influences to g factors from CF parameters and orbital reduction factor have been studied. ► The g factors of ground state varied with CF parameters by a linear relation approximately. ► The g factors of the first excited state varied nonlinearly with these parameters. ► The dependence of k of g factors of 2E state is more sensitive than that of 4A2 state.