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Gems are precious stones that are highly valued for their beauty and rarity. They are formed through various geological processes, often deep within the Earth's crust, and can be found in a variety of rocks and minerals. Some gems, such as diamonds, are crystallized carbon, while others, like emeralds and sapphires, are formed from other minerals. Gems can also come from more unusual sources, such as meteorites, which offer a unique opportunity to own a piece of space. As collectibles, gems are often cut and polished to enhance their natural beauty and are used in jewelry or displayed as works of art. Their value is determined by factors such as color, clarity, cut, and carat weight. Overall, gems represent the intersection of geology, art, and luxury, making them a fascinating and enduring category of collectibles.