It is 4th Chakra. The Heart Chakra is located in the center of the chest. Heart chakra crystal singing bowls are instrumental in inspiring us and helping to create healthy boundaries and unconditional love of self and others. Heart Chakra: love, healing and compassion. Heart Charka – Crystal Singing Bowl. Made of the highest purity quartz crystal. Unique Pink-Purple gradient color. Extremely long-lasting resonance and loud sound. 99.998% pure quartz crystal. It is a great tool for beginners and seasoned players alike. Medium hard rubber provides a firm yet quiet grip on the playing surface of your bowl. 8.6mm thickness o ring which can keep the bowl stable.