Of course, the chief advantages of synthesizing gems in a laboratory (from the manufacturer's perspective) are time and financial savings. Whether under the Earth or in a laboratory, crystal gemstones develop or "grow" when the right combinations of minerals interact under specific chemical and physical conditions. The physical properties of sapphire could blunt the tips of incoming rounds, preventing penetration into the aircraft. They cut this melt material into large, thick rectangular slices to make windows for helicopter gunships. In the 1970s, manufacturers grew immense lab-grown sapphires for a variety of applications. So, can you tell the difference between natural sapphires and lab-grown sapphires? This 790-ct sapphire was cut from colorless corundum grown via the Czochralski (melt) process. Manufacturers still use some of the technological methods used then to synthesize sapphires today. Not surprisingly, sapphires and rubies were some of the first gemstones to be synthesized over 100 years ago. In fact, gem-quality corundum, which includes sapphires and rubies, is rarer than diamond. The demand for sapphires, however, has long exceeded the natural supply. Their beauty and hardness make them ideal choices for jewelry. People have highly prized sapphires for ages.
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