1To embellish or decorate (something) with a jewel or jewels. Frequently in figurative contexts. Usually in passive.
2Of a jewel, or something resembling a jewel: to serve to embellish, enhance, or beautify (something); to adorn in the manner of a jewel.
Early 17th century; earliest use found in John Florio (1553–1625), author and teacher of languages. From en- + jewel.