What method is primarily used to produce synthetic aquamarine?

The primary method used to produce synthetic aquamarine is hydrothermal synthesis. This technique replicates the natural conditions under which aquamarine forms in the Earth's crust. In hydrothermal growth, a nutrient solution containing beryllium and aluminum salts is heated under pressure in a closed environment, which allows the crystals to form slowly over time.

The hydrothermal method is particularly effective for beryl-based stones like aquamarine because it enables the formation of larger, high-quality crystals that can be nearly identical to their natural counterparts in terms of clarity and color. This process enhances the ability to control variables such as temperature, pressure, and mineral content, facilitating the production of consistent and desirable synthetic gems.

While other methods such as flux growth and crystal pulling are indeed used for creating different types of synthetic gemstones, they are not the primary techniques employed for making synthetic aquamarine. Each of these methods has specific applications and suited materials, making hydrothermal synthesis the best choice for replicating the natural growth of aquamarine.