Color: copper turquoise Blue turquoise is generated when a mineral (copper) is present. Green turquoise is generated when iron is present as a mineral. White turquoise is generated when none of the minerals (iron or copper) is present in the stone, which is uncommon. Black turquoise is always generated from some type of rock containing metals such as iron, copper, or nickel. Copper is one of the most important elements for making blue colors in gemstones. It can occur in two forms, native copper and copper metal. Native copper contains around 1% blue color, while copper metal usually contains more than 10%. Metal can be processed into gems with heat and pressure. The higher the percentage of copper metal, the deeper the color. For example, an emerald cut from 100% copper would be completely black. Turquoise has long been considered a royal gift because of its association with royalty and nobility. It was used by ancient Egyptians, Indians, and Mexicans as a sign of status. In Europe, it was given as a reward to soldiers who had saved the life of the king. Today, turquoise is still considered a prestigious gift. It is used to show honor to new employees, and it is often included as part of a promotion package. However, due to its low price tag, it is not reserved exclusively for high-status gifts.