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Stacking faults (SFs) in a (111) single crystal diamond grown on a (111) seed crystal were investigated by taking synchrotron X-ray topography images with various diffraction vector g conditions. We found that the SFs on the {111} plane of fault vector f were a/3 [11 1 ̅ ] , a/3 [ 1 ̅ 11] , and a/3 [1 1 ̅ 1] . Subsequently, we analyzed these images in terms of the b·g extinction criteria and determined that the partial dislocations of the SFs were Shockley partial dislocations with Burgers vector b = a/6 <211>. Then, we determined that the SFs are Shockley type faults. Therefore, we propose that these SFs were generated by decomposition of one perfect dislocation with b = a/2 < 1 ¯ 10 > . [ABSTRACT FROM AUTHOR]