Green gems are precious stones that come in a variety of colors, shapes, and sizes. The three most common types of green gems are JADES, emeralds, and beryls. JADES are a type of mineral composed of two silicate minerals, nephrite and jadeite. Emeralds are a type of beryl, a mineral composed of beryllium aluminum cyclosilicate. Beryls are a group of minerals composed of beryllium aluminum silicate. All three of these green gems are highly valued for their beauty and rarity.