GLS Gales Gemological Research Association is a private independent gemological research laboratory, specializing in the determination of origin and authenticity reports for ruby, moissanite, sapphire and emerald plus other important coloured gems .GLS is to protect all buyers and sellers of gemstones by setting and maintaining the standards used to evaluate gemstone quality. An GLS certificate clearly discloses the details of gemstones , providing confidence for both buyer and seller.The GLS report is based on a precious stone analysis , which is designed to identify the species and variety of gemstone. The GLS report clearly states whether the gemstone is natural or synthetic, provides other data describing its shape , cut , weight , measurements , color , transparency and major optical characteristics, and also includes a detailed photograph of the gemstone.