gem

1 a usually valuable stone cut and polished for ornament a ring set with diamonds and other precious gems Synonyms brilliant, gemstone, jewel, rock [slang] Related Words bauble, bijou, trinket; birthstone; baguette, cabochon, cameo, scarab, solitaire, teardrop; paste, rhinestone, zircon; crown jewels, jewelry Near Antonyms rough

2 someone or something unusually desirable that new car is a real gem she's dating a real gem these days Synonyms catch, prize, jewel, pearl, plum, treasureRelated Words blessing, find, godsend, goody (or goodie), valuable, windfall; booty, loot, plunder, spoil, swag; brass ring; glory, pride; gold, jackpot, prize money, treasure troveNear Antonyms lemon, loser