ruby

(noun) a transparent piece of ruby that has been cut and polished and is valued as a precious gem.

(noun) a transparent deep red variety of corundum; used as a gemstone and in lasers.

(noun) a deep and vivid red color. Synonyms: crimson, deep red.

(adj) of a color at the end of the color spectrum (next to orange); resembling the color of blood or cherries or tomatoes or rubies. Synonyms: red, reddish, ruddy, blood-red, carmine, cerise, cherry, cherry-red, crimson, ruby-red, scarlet.