Persian turquoise is extensively found in Iran's northeastern city of Neyshabur, located about 150 kilometers west of the city of Mashhad in Khorasan Razavi Province, and dates back to 4,000 BCE.

The stone has been mined for thousands of years and used for adornment by many civilizations, including the Egyptian, Persian ... The G.I.A. does not grade turquoise or see many examples of ...

At the Smithsonian’s National Museum of Natural History, visitors can see pieces of this type of turquoise, called Persian turquoise, in a diadem once owned by Napoleon’s second wife ...

As the daughter of King George VI and the sister of Queen Elizabeth II, Princess Margaret wore some enviable jewellery over her lifetime. Margaret's best-known jewel is perhaps her Poltimore Tiara ...