It is a synthetic gem which is created from molten liquids placed in a tear shaped molds to crystallize, leaving them with a tear-like form. It is mostly applied for synthetic Rubies and Sapphires.
A sausage-shaped synthetic single-crystal mass grown in a special furnace, pulled and turned at a rate necessary to maintain the single-crystal structure during growth.
A large single crystal of semiconductor, cylindrical in shape, often 6 to 12 inches in diameter and over one foot long. Wafers are sawn from the boule and further process into PV cells.