Synonyms for gem

noun

1. A jewel

   precious stone, gemstone, bauble, ornament; see jewel 1.

   Types of gems include: diamond, emerald, ruby, pearl, brilliant, aquamarine, amethyst, topaz, turquoise, jade, opal, sapphire, garnet, carnelian, jacinth, beryl, cat's eye, chrysoprase, chalcedony, agate, bloodstone, moonstone, onyx, sard, lapis lazuli, chrysolite, carbuncle, coral, zircon, tourmaline, peridot.

2. A highly valued thing or person

   jewel, prize, treasure, pearl, pearl beyond price, flower, paragon, acme of perfection, masterpiece, trump, ace, nonpareil, beau ideal.