Synthetic crystals are man-made materials that mimic the structure and properties of natural crystals. They are created through various processes, such as hydrothermal synthesis or Czochralski method, allowing scientists to control their size, shape, and purity. These crystals are often used in electronics, optics, and jewelry. One common application of synthetic crystals is in the production of gemstones like synthetic diamonds and sapphires. These materials can be produced at a lower cost and with fewer environmental impacts compared to mining natural crystals. Additionally, synthetic crystals can be engineered for specific functions, enhancing their usefulness in technology and industry.