What is the birthstone for July? Ruby red, of course! The July birthstone is one of the most popular choices in birthstone jewelry, what with Ruby CZ jewelry adding glam to any outfit. July birthstone jewelry transitions well from daytime to nighttime, and it is a great choice for anyone looking to add a bold pop of color to their look. A beautiful jewel tone color, ruby jewelry pairs exceptionally well with other jewel tones, like sapphire, garnet, and amethyst.