From Longman Dictionary of Contemporary Englishrubyru‧by /ˈruːbi/ noun (plural rubies) 1 [countable]DCJ a red jewel2 (also ruby red) [uncountable]CC a dark red colour —ruby adjective
Examples from the Corpus
ruby• How about a ruby and diamond cluster ring that Frank Sinatra gave Lana Turner?• And under the plate, among the spinning wheels, diamonds and rubies do battle against friction.• In pearls and rubies rich the hawthorns show, While through the ice the crimson berries glow.• There weren't any rubies of large size in that period.• When Sophie praised a necklet of rubies that she was wearing, it appeared to give him great pleasure.• All there was around her was endless waves of ruby and ice with the fog crawling beneath her feet.Origin ruby (1300-1400) Old French rubis, rubi, from Latin rubeus “reddish” 