White gemstones are precious stones that come in a variety of colors and shapes. The most common white gemstones are pearls, opals, and jades. Pearls are formed inside the shells of certain mollusks and are composed of calcium carbonate. Opals are made up of silica and water and have a unique play of color. Jades are a type of mineral composed of sodium and aluminum silicate. All three of these white gemstones are highly valued for their beauty and rarity.