Since they require higher temperatures to crystallise, certain gems even form in the Earth's mantle, which is the deeper layer than the crust. They have been appreciated for their flawless beauty, earthy hues, and celestial impacts for general well-being healing for thousands of years, since they were first discovered by humans. The sizes, forms, and colours of these crystals that are mined are diverse. Some examples of Natural Gemstones are amethyst, topaz, diamond, sapphire, ruby, emerald, and quartz.