1. Diamonds: Diamonds are the hardest known natural mineral and are prized for their brilliance and durability. They are made of pure carbon, crystallized under intense heat and pressure deep within the Earth's mantle.
2. Gold: Gold is a soft, malleable, and highly corrosion-resistant metal. Its warm color and luster have made it a popular choice for jewelry for centuries. It's often alloyed with other metals to increase its hardness and durability.
