GT200 - Gem Identification Methods

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.