Matching is an important early childhood math skill that helps in classification of objects. To play, simply face them down in a grid and take turns flipping over the cards two at a time while trying to match the image on the card. Collect the most pairs to win! The game includes 24 cards (12 pairs) and a small print detailing each gemstone. Each card features an original illustration painted by Stephanie Hathaway and printed on premium card stock that has a soft touch finish and rounded corners. They measure 2.5" x 2.5". Cards Included: red jasper tiger's eye citrine pyrite malachite turquoise sodalite amethyst rose quartz quartz smokey quartz obsidian In an effort to be ecofriendly, I have confirmed that the cards in this game are biodegradable and recyclable. We are working toward having 100% biodegradable and/or recyclable packaging and shipping materials as well.