Space Age Crystals: Mini Series: Diamond Crystal Grow Kit. Growing SPACE AGE CRYSTALS is easy, fun and educational. Just dissolve pre-mixed powder in water and within hours sparkling "Diamond" like crystals up to 4 in diameter will start to grow right before your eyes! Contents: Crystal growing chemical, spatula, instructions. Ages 12+. Materials: Crystal, Plastic Dimensions: 2.25"L x 4.75"W x 6.25"H Weight: 0.45 lbs.