More than 2,000 years ago, Egyptian queen Cleopatra developed a passion for emeralds, and they have been in demand ever since. They remain the jewel of choice for many celebrities—famously, Angelina Jolie in $2 million Colombian emerald drops at the 2009 Oscars, and most recently, Viola Davis at this year’s in 112 ct. emerald and diamond earrings. Not only is the gem easy on the eyes, but it’s good for you as well: May’s birthstone can purportedly relieve eyestrain, and stress in general.