While many wearers admire the splendor of the aquamarine, the gemstone seems to hold particularly potent powers for sailors and couples. As its name implies, March’s birthstone often takes on the blue-green hue of the ocean (though deep blue is its rarest shade). This may explain why seafarers have traditionally worn the gem not only to keep them safe but also to ward off seasickness. The stone is also said to soothe spouses; supposedly aquamarine can awaken love in a tired marriage. No wonder it makes an ideal anniversary gift.