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SGL, or Solitaire Gemmological Laboratories, is an independent gemological laboratory that specializes in diamond grading, gemstone identification, and jewelry certification. The company was established in 1981 in India and has since expanded to other parts of the world, including the United States, United Kingdom, Belgium, and Dubai.

SGL provides various services related to gemstones and jewelry, including grading reports, diamond identification, gemstone identification, jewelry appraisals, and more. Their diamond grading reports include information about the diamond's cut, color, clarity, carat weight, polish, and symmetry. The report also includes a diagram of the diamond's proportions and a unique identification number, which helps to verify the authenticity of the diamond.

SGL uses advanced equipment and techniques to analyze and grade diamonds and gemstones. They follow strict guidelines and procedures to ensure that their reports are accurate, reliable, and consistent. SGL's grading reports are widely accepted in the jewelry industry and are often used by jewelry retailers and wholesalers to verify the quality and value of their products.

Overall, SGL plays an important role in the jewelry industry by providing objective and reliable information about diamonds and gemstones. Their services help to promote transparency, fairness, and trust in the market, which benefits both consumers and businesses.