Final answer:
The answer to the riddle is a 'ring,' a round-shaped item that rhymes with 'sing' and is typically worn on fingers.
Step-by-step explanation:
The answer to the riddle "I am round in shape and rhyme with sing." The object described is a ring, which is round in shape and rhymes with the word "sing." Rings are commonly found on people's fingers as a form of jewelry or symbol, such as a wedding ring. The mention of a silver and turquoise ring relates to the decorative aspect and cultural significance that rings can have. Moreover, rings are often associated with personal stories and sentiments, as suggested in the literary excerpts you've provided.