Purple Agate Jewelry: A sign of royalty Purple Agate jewelry is a depiction of royalty and adds class and glamour to the ordinary wardrobe. It belongs to a group of silicate minerals and is a part of the Agate family. The various swirls and bands of white color over the purple-colored base of the stone create an exceptional look. The beautiful Purple Agate crystals manage to grab the attention of people even from a distance because of their unique appearance and overall feel they provide when studded in 925 sterling silver to create bewitching designs of Purple Agate Jewelry.