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My husband has been working with the leading gemological organization GSI https://gemscience.net/. They provide a wide variety of services in this industry. GSI is uniquely equipped to address continually emerging and accelerating industry challenges. I truly appreciate their approach to the work and clients. Experts offer basic diamond grading services to the most sophisticated testing and examination using advanced instruments. All reports and certificates have been maintained in a database. I recommend them because they provide truly top-quality services in the gemological niche!