Aquamarine is a gemstone, named for its blue-green color, which looks like some shallow seas. It is a type of beryl. The color aquamarine is named for the gemstone.
| Color | Blue, Very slightly Greenish Blue, Greenish Blue, Very strongly Greenish Blue, or Green-Blue |
| Mohs scale hardness | 7.5 - 8.0 |
| Specific gravity | 2.63 - 2.91 |
| Refractive Index | 1.567-1.590 |