GM100 - Gem and Jewellery Trade Secrets

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JDMIS Fine Jewellery Design Programme GM100 Become a Certified Fine Jewellery Designer! Jewellery Design I Jewellery Design II Digital Jewellery Design I Digital Jewellery Design II Gem and Jewellery Trade Secrets Epic Jewellery and Contemporary Trends

JDMIS PreciousMetal Arts Programme GM100 Become a Certified Precious Metal Artist! Precious Metals I - Creative Silver Modelling Techniques Precious Metals II - New Technologies and Mixed Media Precious Metals III - Powder Metallurgy Master Techniques Precious Metals IV - Traditional Metalsmithing Gem and Jewellery Trade Secrets Epic Jewellery and Contemporary Trends

JDMIS Fashion Jewellery Arts Programme Become a Certified Fashion Jewellery Artist! Fashion Jewellery I - Materials, Techniques and Creativity Fashion Jewellery II - Professional Techniques, Efficiency Fashion Jewellery III - Master Techniques Gem and Jewellery Trade Secrets Epic Jewellery and Contemporary Trends
Students Understanding the properties of gemstones

Designed for sales professionals, trade members and individuals passionate about the jewellery they create or wear, this exciting programme offers unique insight and understanding of the jewellery industry. Divided into three broad sections, it covers the essentials of coloured gems, diamonds and jewellery; participants gain valuable information to set them apart from most other jewellery designers or sales personnel.

Explore a variety of gemmological subjects such as gemstone classification, identification of gemstones and how professionals value and document these rare materials. The programme introduces common industry terms and accurate loupe-handling and observation skills and allows you to witness, handle and differentiate many imitations and compare them to their natural counterparts. Explore the worlds of precious metals and appreciate jewellery manufacturing methods and how gemstones are securely set into jewellery.

Lessons in this course of study include:

Coloured GemstonesGM101 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.
Modular Prerequisite: GM101 

Phenomenal and Imitation GemsGM103 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.
Modular Prerequisite: GM102 

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.
Modular Prerequisite: GM103 

Diamonds & Diamond SimulantsGM105 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. Modular Prerequisite: GM105

Pearls; Natural, cultured and imitationGM107 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. 
Modular Prerequisite: GM107

Precious MetalsGM109 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.

Jewellery Manufacturing MethodsGM110 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.
Modular Prerequisite: GM109 

Organic GemsGM111 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. 

Jade and Jade ImitationsGM112 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.

Course Duration:

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

Course Fees:



Instructor: Tanja Sadow

Tanja Sadow

 JDMIS Fine Jewellery Designer Diploma

This course is part of the JDMIS Diploma in Fine Jewellery Design

Precious Metal Art sDiploma

This course is part of the JDMIS Diploma in Precious Metal Arts


Fashion Jewellery Arts Diploma

This course is part of the JDMIS Diploma in Fashion Jewellery Arts

Unique Modular Offering

Individual lessons in this course may be takenindependently. Some prerequisites apply.

Visit our online certificate course calendar for up-to-date schedules of upcoming courses. All certificate courses are subject to JDMIS' short course attendance and refund policy
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