Birthstone to September.
Chemical formula: Al2O3 Formula name: Aluminum Oxide
Member of the corundum family.
Colors: All colors except for reds, red corundum are called ruby. Trace elements of iron, titanium, chromium, copper or magnesium being present during the formation of the crystals are responsible for the colors we see.
Sapphires are used in many non-ornamental applications, ie: watch faces, electronic wafers, covers for scientific instruments, and infrared optical components.
World famous sapphires
Hill’s Kashmir Pendant – Owned by railroad mogul James J. Hill in the late 19th century, this 22.66-carat sapphire surrounded by diamonds is a perfect example of a Kashmir sapphire with its velvety luster.
Rockefeller Sapphire – The Rockefeller sapphire belonged to John D. Rockefeller Jr., the only heir of the Rockefeller empire. It is said that the stone was acquired from the Indian Maharaja Mir Osman Ali Khan, the last Nizam of Hyderabad, in 1934. The 62.02 carat gemstone is internally flawless and retains a deep cornflower blue.
Stuart Sapphire – Part of the Royal Crown Jewels of Queen Elizabeth II, this sapphire was originally acquired by Robert II of the House of Stuarts in the 14th century. The Stuart sapphire rests on the crown band, weighing 104 carats with a cabochon-cut. It is one of the most historically significant sapphires.
Logan Blue Sapphire – Named after Mrs. John A. Logan after she donated the sapphire to the Smithsonian Institute, this cushion-cut stone is originally from Sri Lanka. Weighing 422.99 carats with no internal flaws, it is the second largest sapphire in the world.
Queen Marie of Romania Sapphire – The 478.68 carat, cushion cut, cornflower blue sapphire was Cartier’s prize jewel at the 1919 Autumn Exhibition in San Sebastian, Spain. It was admired by royalty from all over the world. Prince Ferdinand bought the sapphire pendant for his mother, Queen Marie of Romania, which she later worn to his coronation in 1922.
Blue Giant of the Orient – At 466 carats, the Blue Giant is the largest faceted sapphire in the world. The gemstone first made headlines in Sri Lanka in 1907 but mysteriously disappeared for almost a century until recently. It is often called a Kashmir sapphire not because of its origin but it’s corn flower blue that resembles the best sapphires in the world.
Mona von Bismarck Sapphire Necklace – The 98.57 carat sapphire necklace is a great example of Art Deco design. It’s set in platinum and accented with diamonds and sapphires. This Cartier necklace was acquired by the American socialite Mona vin Bismarck who married Count Eduard von Bismarck in the late 1930s.
Star of India – The Star of India is one of the biggest sapphires in the world at 563.35 carats. It was donated to the American Museum of Natural History by J.P. Morgan in the early 20th century. In 1964, the sapphire was famously stolen from the Museum and turned up in a Miami locker several months later.
Royal Sapphire Engagement Ring – This famous royal engagement ring was first worn by Princess Diana. It was purchased through Garrard Jewelers and has made sapphire engagements popular ever since. Prince William presented his mother’s ring to Kate Middleton at their engagement last year as a commemorative and romantic gesture.