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Crystal is a mineral that represents a diamond. It is a white, colorless gem that is a diamond look-alike with good durability and brilliant sparkle. Even though they occur in nature, all crystals that are sold as jewelry are lab-created. Crystal is created using a combination of silica (quartz sand) and natural minerals. To avoid stress and inclusions, the glass is cooled slowly. Color Colorless quartz Description Mohs' hardness rating of 7. Shop Crystal