Fantasia Boxed Collection: Natural Birthstone Collection in Presentation Case - Set #5 - As Nature Made Them - Educational Natural Rock, Fossil, Gemstone & Mineral Specimens for The Classroom A great way to introduce childern to the joys of rock collecting and to get them excited about these natural wonders of the world! This fun and entertaining selection provides a hands on learning experience with real earth mined specimens! A wonderful gift idea for aspiring geologists of all ages! Each individual specimen measures around 1/4" to 3/4" in size! Authentic Fantasia Stones - A leading brand around the world for geologists, jewelers, and mineral collectors.