The word "ruby" refers to a precious gemstone that is known for its red color. It is also often used to describe anything that is bright red in color. Full definition
I found this pair in the most gorgeous shade of ruby red on sale at Anthropologie! (brownpaperdoll.com)
The artisan prints fine lines of ruby red on a warm white background bordered in mahogany brown. (polyvore.com)
Agrigan Black paint job — a special paint with ruby red metallic flakes that changes colour in direct sunlight — lightweight carbon fibre accents including the front splitter and air intakes, carbon fibre side blades and a new rear diffuser. (carsuk.net)