Fluorite Tumbled Stone (Approx. 3/4" - 1 1/8") (Green, Blue, Purple, Clear, Rainbow) Supports Healthy Brain Function, Crown Chakra 0746 Excellent for studying and focus. Provides Protection. You will receive one stone that I will intuitively choose from the ones pictured in this listing. Size is approximate and each stone varies. See more at stonepathtrading.com