Aquamarine is a type of crystal that can be found in the water column of Earth. It is a beautiful blue-green color and has a very high refractive index, meaning it can be seen in direct sunlight. Aquamarine is also one of the most durable crystals on Earth, being able to resist wear and tear. To clean aquamarine crystal, you will need to first remove any dirt or other debris that may have been built up over time. Next, use a soft cloth or paper towel to clean the surface of the crystal. Be sure to dry the crystal thoroughly before putting it back into its container or display case.