At HealinStones, our goal is not only to provide high-quality items, but to provide information about individual gemstones. As such, we use ideas from books and websites to help our research and content development. No content is copied directly, but we'd particularly like to acknowledge the work of Robert Simmons & Naisha Ahsian for information in their book "The Book of Stones" and also various websites including CrystalVaults.com and GemSelect.com.