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2. Black Star of Queensland - Wikipedia

   en.wikipedia.org/wiki/Black_Star_of_Queensland

   The Black Star of Queensland, also known as the Brimstone of Queensland, named after its nature and place of origin, is a 733-carat (146.6 g) black sapphire, and was the world's largest gem quality star sapphire until The Star of Adam was discovered. The Black Star sapphire is an oval-shaped gemstone cut as a cabochon like all other star ...

3. List of sapphires by size - Wikipedia

   en.wikipedia.org/wiki/List_of_sapphires_by_size

   Star of Artaban: Sri Lanka 287 carats (57.4 g) Star Blue-violet National Museum of Natural History, Washington [9] Star of Bombay: Sri Lanka 182 carats (36.4 g) Star Blue-violet National Museum of Natural History, Washington [10] Ruspoli Sapphire: 136.9 carats (27.38 g) [11] Stuart Sapphire: Sri Lanka 104 carats (20.8 g) Blue Tower of London ...

4. List of individual gemstones - Wikipedia

   en.wikipedia.org/wiki/List_of_individual_gemstones

   Logan Sapphire; Star of Bombay, given to Mary Pickford by Douglas Fairbanks, Sr; Star of India; Stuart Sapphire; Black Star of Queensland; Star of Adam, with a weight of 1,404.49 carats (280.898 g), it is the largest star sapphire in the world. Queen Marie of Romania Sapphire

5. Black Star sapphire - Wikipedia

   en.wikipedia.org/wiki/Black_Star_sapphire

   Black star sapphire, also known as 'natural star sapphire' is a type of corundum (aluminum oxide). It is usually cut into a dome shape to show a star feature. If it is cut with a flat or almost flat face, then a golden colour is revealed. The chemical composition and features for black star were analyzed in the Journal of Gemmology. [citation ...

6. List of rubies by size - Wikipedia

   en.wikipedia.org/wiki/List_of_rubies_by_size

   Maharlika Star Ruby India: 10,820 carats (2,164 g) Philippines: Liberty Bell Ruby: Burma: 1976 [a] 8,500 carats (1,700 g) Stolen and still missing [2] Neelanjali Ruby: 1,370 carats (274 g) Prince of Burma: Burma: 1996 950 carats (190 g) Rosser Reeves Ruby: Sri Lanka: 138.7 carats (27.74 g) National Museum of Natural History [3] DeLong Star Ruby ...

7. Sapphire - Wikipedia

   en.wikipedia.org/wiki/Sapphire

   Star sapphire 68 carat star sapphire in round mogul cut - men's ring version - 750 yellow gold - Russian goldsmith - handmade around 1990. A star sapphire is a type of sapphire that exhibits a star-like phenomenon known as asterism; red stones are known as "star rubies".