Ruby is the birthstone for July and the most prized of the red gems. It is a variety of corundum colored by chromium, it rates 9 on the Mohs scale of hardness, and the finest stones glow with a red the trade calls pigeon’s blood. Charles Schwartz & Son, Washington DC’s oldest jeweler, founded in 1888, has handled estate and… Read more »
Ruby, July’s Birthstone: A Guide to Estate and Antique Rubies in Washington DC
Jul 29, 2026
