Rare Blue Coral, Black Pearl, Amethyst, Dumortierite, Blue Chalcedony, Carved Lavender Jade, Faceted Blue Lace Agate with silver necklace. Coral is created by the marine animal, coral polys and apprears in various colors. Pearls are created in the living mollusk. Amethyst is a quartz treasured by royalty for centuries. Dumortierite is an aluminum borosilicate mineral of the quartz group. Blue Chalcedony is a type of cryptocrystalline quartz. Jade is a crystal to opague mineral that comes in a variety of colors that has been valued for centuries especially by Asian culture. Blue Lace Agate is a variety of banded chalcedony, a mineral of the quartz family. Great for casual, business and dressy styles! The amethyst clip on earrings pictured below are a wonderful compliment to this necklace.