There is alot of information linked with Rose Quartz.

Rose Quartz is thought to heal the heart, reawakens trust, releases tension and stress, dispels fear and suspicion, calms the mind, assists in releasing worry, fear, anxiety and past emotional trauma, helps balance physical heart

The fourth Chakra is green in colour and called Heart Chakra. Rose Quartz is one of the gemstones associated with this chakra.