Single crystals d YBa2Cu3Oe+,, Y0.SGd0.5Ba2CU30e+y and GdBazCu3%+, have been prepared by the self-flux method, and their growing conditions have been optimized through several trial runs. A post-annealing of as-grown single aystals in high-pressure (-150 bar) pure oxygen proves to be very effective in increasing their T, Over 90 K h u e back diffraction patterns confirmed the goo6 quality o f the samples. The morphology, composition analysis and the magnetic properties of these crystals are also reported.