Space Age Crystal Growing Kit: 4 Crystals (Citrine, Ruby, Amber) Grow your own gorgeous crystals with the Space Age Crystal Growing Kit: 4 Crystals (Citrine, Ruby, Amber) from Kristal Educational. Prep the growing solution and watch as dazzling quartz crystals begin to bloom. For detailed instructions, please refer to the included booklet. Each kit grows one crystal cluster and one single crystal, both up to 4-inches in diameter. Each kit contains crystal-growing chemicals, crystal-growing containers, stirring rod, and 48-page Space Age Crystals booklet. Additional items may be required. For ages 12 and up - Instruction booklet included