Ruby engagement rings? Absolutely! Diamonds may be a girl's best friend, but Ruby engagement rings are a unique, original, and a far more affordable choice. Gem of hot summer nights and steamy red sunsets, ruby is the birthstone of July. Show the world the passions within you with a fiery ruby ring. The birthstone of December, the tranquil azure color of a blue topaz ring can evoke thoughts of warm Caribbean seas on a cold winter day.