Guild Gem Laboratories


    Guild Gem Lab, based in Los Angeles, CA, USA, was established by the renowned American gemologist Mr. Charles Carmona in 1980. Guild owns rich experience, comprehensive database and solid research background in identification, grading and geographic origin determination on colored gemstones.
    At present, Guild  set laboratories in Los Angeles, Hong Kong and Shenzhen.

    Color Grading and Origin Determination

    Since 1980, Guild has been focusing on the study of colored gemstones, focusing on treatment detection, color grading and origin determination of emeralds, rubies, sapphires and more.

    Trusted and Accurate

    The principle of Guild Gem Laboratories is to “provide clients with professional and trustworthy services”, ensuring the integrity, and accuracy of gem testing.

    Highly Efficient

    Compared with the testing time of 1-2 months in other gem labs, Guild provide services of high quality and efficiency. The test in Guild can be completed in only 5 workdays in normal situations on the premise of maintaining the quality, which save much valuable time for our customers.

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