Promise Rings are exchanged for a variety of reasons, whether mounted with a Diamond, Sapphire, Emerald or Ruby. Pre-engagement Promise Rings with an Amethyst, Garnet, Citrine, Opal, Moonstone, Zircon, Tourmaline, Topaz or Aquamarine are given without an official commitment while Purity Promise Rings symbolize a promise to remain chaste. In some European cultures, it was customary for a parent to give a Purity Promise Ring to a child symbolizing the child’s promise to remain pure until marriage. Friendship Promise Rings signify a genuine commitment to friendship, while Religious Promise Rings indicate a lifetime commitment worn by the believers of a particular faith.