About This Item With this small initial charm made of emerald plated in yellow gold, you may simply tell everyone what your name is. Make your own personalized 18-inch yellow gold-plated chain to go with your letter Y necklace. Details about Gemstones Because of their brilliance and scarcity, emerald stones are considered one of the four genuinely precious jewels. Emeralds are prized for their vivid green hue and are now frequently connected to verdant vistas and the splendor of the natural world. Emerald is the birthstone for May and is customarily given as a present on anniversaries of 20 and 35 years old.