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Solitaire Gemmological Laboratories Ltd. (SGL) is an independent international gem testing laboratory. Trusted by jewellers and consumers alike, reports by Solitaire Gemmological Laboratories represent the highest standards of reliability, consistency and integrity. With our commitment to high certification standards we serve the interests of the gems and jewellery industry and support gemmological research worldwide through our centres in the United Kingdom and India. A Solitaire Gemmological Laboratories certificate offers unmatched assurance of a diamonds quality and authenticity.