Centred charge donor related diamagnetic susceptibility and optical properties of a spherical GaAs quantum dot are presented. In particular, effects of intrinsic parabolic and shifted parabolic potentials on these quantities are investigated. This is theoretically achieved by solving the Schrödinger equation within the effective mass approximation. It is observed that the parabolic potential reduces the magnitude of the diamagnetic susceptibility while the shifted parabolic potential increases it. Other findings are that the parabolic potential blue-shifts both the absorption coefficient and the change in refractive index of quantum dots, while the shifted parabolic potential red-shifts these quantities. These features are discussed

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