Precious Gems 4, from Europrice, is the fourth and final volume in the coloring collection with illustrations inspired by precious stones and crystals. The Precious Gems collection invites you to color illustrations inspired by precious stones and crystals, with faceted geometric shapes that lend themselves well to vibrant and contrasting color combinations. Europrice is the leading children's book publisher in Portugal, with a catalog designed to stimulate creativity and motor skills through pencil and paper, rather than screen. It is a prime option to complete the collection with the final volume, bringing together the four titles on crystals and faceted shapes.