Aquamarine is a popular and valuable gemstone that belongs to the beryl mineral group, the same family as emerald and morganite. Its scientific classification is beryl, with the chemical formula Be₃Al₂Si₆O₁₈. Aquamarine crystallizes in the hexagonal crystal system and is known for its excellent transparency and attractive blue hues. The color of Aquamarine ranges from pale blue to deep blue and sometimes slightly greenish-blue. The color is mainly caused by the presence of iron within the crystal structure. Darker blue stones are generally more valuable than lighter ones. High-quality Aquamarine gemstones are usually eye-clean, meaning they have very few visible inclusions, which enhances their brilliance and appeal.