Blue Aquamarine Crystal "Y' Necklace. This beautiful necklace goes with every outfit, day or night. A must-have piece for this Season & all year-round. Aquamarine is also associated with tranquility, serenity, clarity, and harmony. As the first of the spring birthstones, the sea blue crystal represents transformation and rebirth. It embodies youthful vitality, purity, loyalty, hope, and truth.