Ruby

Ruby. The second hardest gems after diamonds, rubies have always been prized for their color. During the Middle Ages, deep-red rubies were imported into Europe from India, Sri Lanka, and Burma. From Afghanistan, merchants brought paler, pinkish stones known as balas, or spinel rubies, which were not as prized because of their less brilliant coloration. Rubies were deemed chief among stones, and those as bright and lustrous as pomegranate flesh were especially celebrated. Their intense red color has often been associated with passion, protection, and love.

Late medieval and Renaissance lapidaries, or collections of writings on precious stones, not only described the physical properties of gems, but also ascribed to them magical powers and intrinsic virtues. Often relying on Roman and Greek sources and more recent texts, these lapidaries proclaimed that the ruby could promote health, dispel bad thoughts, serve as a defense against poison, bring concord between people, and even serve as a guard against lust. In some cases, it was thought that the stone would darken to transmit important information, like the presence of danger, to its wearer. The ruby was a rare and powerful stone, and it comes as no surprise that it appears in extraordinary jewelry. Reference: The Metropolitan Museum.

Rubies are the birthstone of July although from the 15th century up to the early 20th century it was considered the birthstone of December.