What is a cluster? Cherron December 22, 2017 21:15 Follow A cluster is a grouping of two or more gemstones that remain connected to each other, just as they grew in nature. Related articles What is a sphere? What is a Vogel? What is a worry stone, and how does it differ from a palm stone? What is double terminated? What is a wand? Comments 0 comments Please sign in to leave a comment.