The Star of Adam
| Type of stone | Sapphire |
|---|---|
| Weight | c. 1,404.49 carats (280.898 g) |
| Color | Blue (exact colour grade unknown) |
| Cut | Oval |
| Country of origin | Sri Lanka |
| Estimated value | Est. US$100–300 million |
The Star of Adam is an oval-shaped blue star sapphire, currently the largest star sapphire in the world. It weighs 1,404.49 carats (280.898 g; 9.9084 oz). Prior to its discovery in 2015, the Black Star of Queensland, weighing 733 carats (146.6 g), was the largest star sapphire gem in the world.