Aquamarine – Natural, Faceted, Blue, 1000 ct

Natural aquamarine displays pleochroism. It shows two different colors when viewed from different angles. Aquamarine can appear blue from one angle and green or colorless from another. However, this doesn't mean aquamarines colorless from one angle qualify as white aquamarines. "Most Precious," a 1,000-ct aquamarine on display at the Smithsonian Institution. Photo by Cliff. Licensed under CC By 2.0.

Article: Are White Aquamarines Genuine Aquamarines?

Credit: Cliff