The Guardian Angel collection gives pawrents peace of mind with the magical and mystical protection of genuine crystals. Rose quartz envelopes your furbaby in the essence of love even when you're not with them and soothes nervous energy. The high vibration of rose quartz can help create balance and health on physical, emotional, and mental levels. It's light weight and durable to make it easy to enhance your pet's quality of life! 1/8" clasp opening fits around most collar loops