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On December 22, China`s leading manufacturer of sapphire ingots and sapphire substrates, the first sapphire crystal developed by ZJJS Crystal Material Technology Group, a 700kg super-sized sapphire crystal, was successfully released. According to the company, China's first 300kg crystal was released in 2017, and the 450kg sapphire crystal broke the R&D record in this field in 2018. This time, the 700kg crystal was successfully released, setting a new record again.