Start your journey at the source of gemmology: learn about gemstone origins, how gems are mined and who the middle-persons involved are that craft and carry these extraordinarily valuable minerals to market. Learn about gemology quality and value factors for all types of gems, from Diamonds to Coloured Stones, Organics to Jade. This comprehensive course gives you the knowledge and power to take control of your gem purchases (if you are a collector or enthusiast) or your sales process (if you are a designer or jewellery professional). Beyond the common trade practices and pricing, you will learn about imitations, synthetics and treatments sometimes used to enhance or even to deceive. Gemmology is a great chance for personal development.

Course outline

  • GM101 Coloured Gems - The Earth's Natural Wonders

    GM101 Coloured Gems - The Earth's Natural Wonders

    Learn about a variety of beautiful natural minerals and how gemologists analyze and classify them. The flow from mine-to-market is understood together with common gem cutting practices.

  • GM102 Factors Affecting the Value of Gems

    Unlike diamonds, the 4 C's are weighted differently when applied to coloured gems. Learn methods for evaluating colour in gems and how different clarity types are assessed. See a wide range of cutting styles in todays market and methods for carat weight assessment.

  • GM103 Synthetic, Imitation & Treated Gems

    GM103 Synthetic, Imitation & Treated Gems

    Imitation gems and treatments can be traced through history but synthetic or 'cultured' gems use more modern processes that are sometimes misrepresented at the buyer's expense. Understand the synthetics readily available in the market, imitations and treatments of gems and their proper disclosure practices in the gem trade.

  • GM104 Phenomenal Gemstones

    An array of special gem materials which react in amazing ways to certain light sources are covered. From common to rare, students discover all about gem phenomena and phenomenal imitations.

  • GM105 Diamonds, the 4 C's and Beyond

    GM105 Diamonds, the 4 C's and Beyond

    Colour, Clarity, Cut and Carat are explained from a gemmological point of view. The origins and history of diamonds are reviewed and an understanding of the modern diamond trade is imparted.

  • GM106 Natural Diamonds, Simulants & Synthetics

    Many materials are made to resemble diamonds; some can be easily identified, while others nearly identical. The differences between natural and synthetic diamonds are covered. Tips and quick practical tests are shared to assist in identification.

  • GM107 Pearls: Natural, Cultured & Imitation

    GM107 Pearls: Natural, Cultured & Imitation

    Differences between the varieties of pearls readily available in the market today are identified. Origins of some of the most beautiful specimens as well as common imitations and tests are covered. South sea, Japanese and Chinese pearls are closely inspected.

  • GM108 Assessing Pearl Value

    Varied examples are used to identify the different quality factors of pearls and how they affect price. Colour, lustre, shape, spotting, nacre thickness & make are amongst factors explained & observed.

  • GM109 Platinum, Gold and Silver

    GM109 Platinum, Gold and Silver

    An overview of the history, terminology, science, testing and grading of metals is presented, as well as an analysis of the world's most impressive precious metal jewellery are discussed. Metal purity is documented through Trade- and Hall-marks which are inspected.

  • GM110 Jewellery Manufacturing

    GM110 Jewellery Manufacturing

    The history of jewellery manufacturing is as colourful as jewellery itself. This overview also focuses on today's manufacturing processes and factors that affect durability, quality and price.

  • GM111 Organic Gems

    GM111 Organic Gems

    Materials produced by something living or once living are known as Organic Gems. Amber, Jet, Bone, Ivory, Shell and Coral are covered, with other less common but unusual types found in jewellery today.

  • GM112 Jade and Jade Imitations

    GM112 Jade and Jade Imitations

    As one of the most popular gems in the Far East, Jade has many imitations, and two genuine forms: Jadeite and Nephrite. Learn Jade's history, value factors, imitations & lore.

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  • Tools


    Like all JDMIS courses, students receive everything they need to complete all their coursework. This course includes all the tool and reference material needed in order to fully appreciate the gem exhibits and the jewellery samples.

  • Materials


    This popular course takes place in our Diamond Room where participants are able to see, examine, scope and understand Tanja's collection of over 1,200 gems, jewellery pieces and examples, including rare and valuable specimens as well as common imitations found in jewellery markets in the region.

  • Learning path

    Learning path

    This course is a Core Component of all learning paths. We refer to this modules as CC.

    Participants attending and completing this programme can choose to enroll for any full diploma.

  • Duration


    34 hours

    6 weeks (1 day/week), or
    12 weeks (1 half-day/week)

    JDMIS runs week-day, weekend and weeknight courses for this popular course. JDMIS also has flexible make-up schedules and graduates can return without cost for refresher courses (subject to availability).

  • Course fee

    Course fee

    SGD 2,088

    inclusive of GST

    Course fees include comprehensive reference materials provided during the course.

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