Shop for Crystal Quartz Merkaba Star at low price. This white crystal is considered a ?master healer.? It's said to amplify energy by absorbing, storing, releasing, and regulating it. It's also said to aid concentration and memory. Physically, clear crystals are claimed to help stimulate the immune system and balance out your entire body. Crystal healing therapy involves placing gemstones on the body to draw out negative energy. Crystal healing is an alternative medical technique in which crystals and other stones are used to cure ailments and protect against disease.