![](http://www.ecns.cn/hd/2021/02/07/89299ee841d1479ab6ea75d6318ce8c1.jpg)
A sapphire named Star of India is on display at the American Museum of Natural History on Feb. 5, 2021. (Photo/Agencies)
At 563 carats, the Star of India is the world's largest gem-quality blue star sapphire. Some 2 billion years old, it is also one of the most well-known objects in the world. The reimagined Allison and Roberto Mignone Halls of Gems and Minerals of the museum is expected to reopen in 2021 spring.
![](http://www.ecns.cn/hd/2021/02/07/6986dceed278401fa04dbfb7feb3e050.jpg)
A sapphire named Star of India is on display at the American Museum of Natural History on Feb. 5, 2021. (Photo/Agencies)
At 563 carats, the Star of India is the world's largest gem-quality blue star sapphire. Some 2 billion years old, it is also one of the most well-known objects in the world. The reimagined Allison and Roberto Mignone Halls of Gems and Minerals of the museum is expected to reopen in 2021 spring.
![](http://www.ecns.cn/hd/2021/02/07/42392967704c48acb90fe3a334e2846b.jpg)
A sapphire named Star of India is on display at the American Museum of Natural History on Feb. 5, 2021. (Photo/Agencies)
At 563 carats, the Star of India is the world's largest gem-quality blue star sapphire. Some 2 billion years old, it is also one of the most well-known objects in the world. The reimagined Allison and Roberto Mignone Halls of Gems and Minerals of the museum is expected to reopen in 2021 spring.
![](http://www.ecns.cn/hd/2021/02/07/299c23463eeb48fdbfebbee4600ac4a1.jpg)
A sapphire named Star of India is on display at the American Museum of Natural History on Feb. 5, 2021. (Photo/Agencies)
At 563 carats, the Star of India is the world's largest gem-quality blue star sapphire. Some 2 billion years old, it is also one of the most well-known objects in the world. The reimagined Allison and Roberto Mignone Halls of Gems and Minerals of the museum is expected to reopen in 2021 spring.