The Logan Sapphire is a flawless specimen from Sri Lanka, a cushion-cut stone which possesses a rich deep blue color and is the second largest (blue) sapphire known, weighing 422.99 carats (84.6 g).
The sapphire was mined from Sri Lanka.[1] It likely originates from Ratnapura, the "City of Gems".[1][2] One of its early owners was Sir Victor Sassoon, 3rd Baronet of Bombay, a member of the wealthy Sassoon family. According to the Smithsonian Institution, the Sassoons may have acquired the sapphire from an Indian maharaja.[3]
The stone, roughly the size of an egg, is one of the world's largest and most famous sapphires. The Logan Sapphire is named after Polly Logan, who donated the gemstone to the Smithsonian Institution in 1960.[4]
The Logan Sapphire is set in a brooch surrounded by 20 round brilliant cut diamonds weighing, in total, 16 carats (3.2 g). It is currently on display at the National Museum of Natural History in Washington, D.C., alongside the Bismarck Sapphire Necklace and the Hall Sapphire and Diamond Necklace.[5][6]
References
- ^ a b Hansen, Robin (2022). Gemstones: A Concise Reference Guide. Princeton University Press. p. 81. ISBN 978-0-691-21448-1. OCLC 1261879655.
- ^ Saul, John M. (2018). "Transparent gemstones and the most recent supercontinent cycle". International Geology Review. 60 (7): 892. doi:10.1080/00206814.2017.1354730.
- ^ Feather II, Russell C. (2016). "The Royal-Blue Logan Sapphire at the Smithsonian Institution". Rocks & Minerals. 91 (1): 59. doi:10.1080/00357529.2016.1099135.
- ^ "Logan Sapphire [G3703]". Smithsonian National Museum of Natural History. Retrieved 20 July 2016.
- ^ The Logan Sapphire Brooch
- ^ Corundum (variety: Sapphire)
External links
 | This article about a specific mineral or mineraloid is a stub. You can help Wikipedia by expanding it. |