Jewels are considered as precious, and they are often valued for their beauty and rarity. Synonyms for the word "jewel" include diamond, gem, precious stone, gemstone, rock, crystal, and valuable. Other synonyms of the word "jewel" include bauble, trinket, ornament, and knick-knack. Some of the less common synonyms include bijou, curio, keepsake, and treasure. The word "jewel" can also be used to describe a person or thing that is highly valued as a prized possession or a valuable asset. Ultimately, the synonym for "jewel" that is used will depend on the context in which it is being used and the tone of the sentence.