A natural crystal ball is a decorative object made from natural crystal. It is usually made by polishing and grinding a large piece of crystal rough, and the inside is usually hollow and can be used to store liquids or gases. A natural crystal ball is a decorative object made from natural crystal. It is usually made by polishing and grinding a large piece of crystal rough, and the inside is usually hollow and can be used to store liquids or gases. A natural crystal ball is a decorative object made from natural crystal. It is usually made by polishing and grinding a large piece of crystal rough, and the inside is usually hollow and can be used to store liquids or gases. A natural crystal ball is a decorative object made from natural crystal. It is usually made by polishing and grinding a large piece of crystal rough, and the inside is usually hollow and can be used to store liquids or gases.