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 Power Renewable Energy Association. It also got Innovation Award for Energy of the Engineer Technology and Innovation Awards 2009 and Scottish Green Awards for the Best Green Industry SME. In 2010 it was listed on GlobalCleantech 100 list. On 28 October 2015, BBC News reported that Aquamarine Power had called in administrators. No buyer was found and less than a month later, on 20 November, the company ceased to trade with the loss of fourteen jobs. Aquamarine Power Aquamarine Power was a wave energy company, which was founded in 2005 to commercialise a wave energy device concept known as the Oyster