Gemstone usually found in. For example, diamonds, which have a cubic crystal system, are often found as octahedrons. Gemstones are classified into different "groups", "species", and "varieties". For example, ruby is the red variety of the species corundum, while any other color of corundum is considered sapphire. Other examples are the emerald (green), aquamarine (blue), red beryl (red), goshenite (colorless), heliodor (yellow) and morganite (pink), which are all varieties of the mineral species beryl. Gems are characterized in terms of refractive index, dispersion, specific gravity, hardness, cleavage, fracture and luster. They may exhibit pleochroism or double refraction. They may have luminescence
Aquamarine (novel) to Florida, the girls are dismayed. They spend hours trying to make their last days together as long as possible, both frightened by the future. When a violent thunderstorm occurs, a large quantity of trash is deposited in the Capri Beach Club. In the swimming pool, Hailey and Claire discover the spoiled yet beautiful creature that will change their lives: a mermaid named Aquamarine. The next morning, Aquamarine surfaces after some hesitation, being stimulated to do so by the presence of the handsome Raymond. During the night, Aquamarine has undergone mild hardships; she has eaten very little, has been separated