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    Rough diamond

    This course is intended for anyone wishing to get into the business of buying and re-selling rough diamonds. Learn how to calculate its price, the optimal yield and compare its value in today’s market.

    Analyze rough diamonds, imitations and price establishment

    This course requires the basic gemmology course or another degree in gemmology as a prerequisite.

    The content of this course focuses on the specificities of rough diamonds, its provenance, its commercial aspect, etc. Students have access to rough diamonds to perform price analysis and estimates.

    Topics covered and tools available during the course

    • Features of the diamond.
    • Geology and formation.
    • Crystalline morphology.
    • Mechanical properties.
    • Natural and artificial colors.
    • The different types of inclusions.
    • The size, sorting of various shapes and imitations.
    • Use of the estimation table for the best yield of a rough diamond.
    • The tools used when buying the rough diamond.
    • The terms of payment during the process of purchase.
    • Laboratory certificates.
    • The documents required for import.
    • Instruments available:  10x loupe, tweezers, vertical/horizontal microscope, immersion liquid,  dichroscope, refractometer, polariscope,  conoscope, spectroscope, optical fiber, ultra violet, hydrostatic balance and gauge.
    • OGI laser scanner

    OGI 2024

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    Work equipment

    • Support: rough diamond.
    • Optional book:  Diamonds in Nature (Ralf  Tappert  & Michelle C. Tappert).
    • Optional book: Diamonds Rough To Romance (Yasukazu Suwa & Andrew Coxon).

    The courses are arranged according to your availability

    The dates & times of the courses are to be agreed between the student and the teacher. The schedules are Monday to Friday from 9am to 12pm and from 2pm to 5pm, and Saturday from 9am to 12pm. If you are not available during the day, a range can be agreed in the evening from 6pm to 9pm (except Saturday and Sunday).

    The total duration of the course is 45 hours, fifteen lessons of three hours.

    Price of the course, CHF 2800.

    This course is taught by David Arredondo, teacher responsible for gemmology and precious metals courses.

    A certificate is delivered following an exam. The test lasts three hours, consisting of a theoretical and practical part.