Established in 2002, GEM International (Hong Kong) Limited is a ISO 9001 certified professional manufacturer of consumer oriented optical goods such as camera filters, extension lenses, lens for iPhone,mobile phone camera add on lenses, digital camcorders and waterproof bags and cases. Our team of professionals, with more than 20 years of experience in designing optical products, is capable of developing innovative products and ensuring top grade quality. The core of our company's business philosophy is best represented by our motto "Better Quality, Better Performance and Better...