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Natural diamonds are diamonds that are created under high pressure and temperature over a long period of time in the earth's crust. They are the hardest known natural substance on earth and are typically mined for use in jewelry. While natural diamonds are more expensive than lab-grown diamonds due to limited supply, they are considered to be more valuable and sought-after. Online retailers offer a wide range of natural diamond products, such as rings and earrings. Gemologists can differentiate natural diamonds from lab-grown diamonds based on their physical properties.