Read the dictionary definition of ruby. All definitions for this word.
1. a deep and vivid red color
2. a transparent piece of ruby that has been cut and polished and is valued as a precious gem
3. a transparent deep red variety of corundum; used as a gemstone and in lasers
4. of a color at the end of the color spectrum (next to orange); resembling the color of blood or cherries or tomatoes or rubies