WordNet sense 1 (a crystalline rock that can be cut and polished for jewelry):

gemstone, stone

WordNet sense 2 (a person who is a brilliant and precious as a piece of jewelry):

jewel

WordNet sense 3 (a sweet quick bread baked in a cup-shaped pan):

muffin

WordNet sense 4 (a precious or semiprecious stone incorporated into a piece of jewelry):

precious stone

WordNet sense 5 (art highly prized for its beauty or perfection):

treasure