A beautiful geological game in a handy size with beautiful art by Uta Krogmann. Color insert for reference and Gemstone identification included. Sharpens visual acuity, concentration, and memory skills. Set includes 18 pairs of 2” x 2” illustrated tiles to match. Created in collaboration with educators, psychologists, parents, artists, and other experts. Sustainably Sourced: Made with recycled board and printed on FSC®-certified paper using vegetable-based inks. For 1-4 Players. Playtime:15-25 minutes. Ages 3 and up.