There’s a long tradition of associating the colors red and pink with love, passion, healing, and matters of the heart. In many ancient civilizations rubies were used to protect wearers from accidents or romantic mishaps.

Over the centuries, pink-to-red garnets, spinels, and sapphires, as well as mineral gems such as rhodochrosite, rose quartz, and pink lace agates were added to the list of gems that were ...