Lotus Gemology

  • Developing a comprehensive colored stone grading system has been the dream of gemologists since the late 1970's, but despite a number of valient attempts, we are no closer to the goal today than we were four decades ago. This article examines the various problems of colored stone grading, explaining why the challenges are at least an order of magnitude greater than the grading of diamonds.

  • In 1878, the noted Austrian mineralogist, Gustav Tschermak von Seysenegg [1836–1927], was the first to properly identify silk in corundum, finding it to be composed of the mineral rutile (TiO2). An English translation of his landmark paper is included, along with the original German version.

  • A brief description of the color types for ruby and sapphire used at Lotus Gemology.

  • Lotus Gemology warns that oiled rubies, sapphires and spinels are entering the Bangkok wholesale market in increasing numbers. Most, but not all, of these gems are originating from Burma.

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    Introducing the Lotus Hat. It's tremendous.

    Perfect for keeping the sun off your face when you're visiting mines and markets, and a great accessory in the city.

    Front reads "LOTUS gemology"
    Back reads "making GEM • ology great again"

    Hat is made of cotton and is adjustable in the back.

    $30 per hat, including international shipping & handling from Thailand
    Ships via International Parcel Air (2-3 weeks)

    *Please note that any customs duties/fees in the recipient's country are not included and are the responsibility of the recipient*

    Once you click the "Add to Cart" button below, you can select the quantity on the next page.

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  • An orangish pink “padparadscha” sapphire was submitted for testing at Lotus Gemology’s Bangkok laboratory. Testing showed a number of conflicting features that suggested the gem was a cleverly treated synthetic pink sapphire designed to imitate natural padparadscha.

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