Emeralds are gem-quality specimens of the beryl mineral family with a rich, distinctly green color. They are found in igneous, metamorphic, and sedimentary rocks in a small number of locations worldwide. For over 5000 years, emeralds have been one of the most desirable and valuable colored gemstones.
For example, the Agway Elevator was built on a concrete mat 3 feet thick which in turn rests on a natural foundation of stiff clay. But whatever the foundation for the elevator was, be it wood pilings or concrete slabs, construction of the elevator itself could begin once the base was completed.
The main service elevator, positioned in the central core of Burj Khalifa, has the worldâs highest elevator rise at 504 metres â more than the height of Taipei 101 in Taiwan (448 metres). It travels at nine metres per second and also has the worldâs longest travelling distance for an elevator.