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The ring form of Plasmodium falciparum is the early trophozoite stage, typically observed in peripheral blood smears of individuals infected with malaria. It appears as a delicate, thin ring within the red blood cell (RBC), with a central vacuole resembling a ring or a signet ring. The nucleus is small and stained purple, while the cytoplasm is pale blue, often adhering to the RBC membrane. 

Multiple ring forms may be present in a single RBC, a distinguishing feature of P. falciparum infection which can be clearly seen in this Image.