'Relics' is a translation of the Sanskrit Sharira, which literally means 'body', but in Buddhist uSage most often refers to the sacred Relics found in the cremated remains of the Buddha or of a Buddhist monk.
. . . Everyday when visitors came to have a look at the Sharira, I always followed them. The visitors' opinions about the Relic varied Greatly. I had seen it many times; at first it looked to me as of the size of a green bean and of a dark purple color. In the Middle of the tenth month, after I had paid reverence to the Mahayana and Hinayana Tripitakas, I went again to look and it was the same size as before but like a brilliant red Pearl. As I was impatient to see how it would transform itself, I again prostrated myself and felt pains all over my body; the Sharira was bigger than a yellow bean, half yellow and half white.