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Go Further with

Gem Master Class
Fully Online | 29 USD
By Tanja Sadow G.J.G.

Do you want even more confidence in your next purchase?

Stepping into the gem and jewellery world can be daunting. You might worry about overpaying, buying fakes, or simply not knowing enough to make smart choices

 With this exclusive crash course, you’ll move from doubt to confidence, ready to make your mark in the jewellery industry.

Limited Run

Enrolment and early-bird exclusive bonuses are ending soon!

By the end of this Masterclass, you will

Master the 4 C's: Learn the secrets of Color, Clarity, Cut, and Carat to spot the best gems.

Pearl Power: Dive into the trendy world of pearls, from natural to imitation.

Buy with Confidence: Get practical tips for wise gem shopping.

Smart Shopping: Feel bold and informed at every purchase, boosting your designs and business.

Picture of a man examining a green colored gems
"Great instructor who has a vast knowledge of the gems and industry. I have become more knowledgeable, less susceptible to scams when buying gems with increased basic knowledge to mining, gems and the environment."
Jasmine L.

Master 6 Comprehensive Topics

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The 4 Cs of Gems

Learn how the 4Cs: colour, cut, clarity and carat weight affect the values of different gems in the market.

Picture of measuring raw cut diamond

Facts About Diamonds

Colourless diamonds are perhaps the most popular gemstone – learn how the 4 Cs apply specifically to this unique gem.

Coloured Gemstones

Appreciating Coloured Gems

Learn how coloured gems are classified and how to best appreciate their rare properties.

Picture of strands of pearls of different colours

Characteristics of Different Types of Pearls

Explore the different pearls available in the market. Learn about their origins and properties.

Different Methods of Cultivating Pearls

Understand the different ways that pearls are formed, either naturally or artificially by cultivation

Tips To Identify Imitations

Learn what are imitation pearls and tips to test the authenticity before making purchases

Expert Instructor

Tanja Sadow is an award-winning jewellery designer and gemmologist with more than 4 decades of experience educating the jewellery industry across 4 continents. As Dean and founder of JDMIS, Tanja trains teams from top jewellery brands and works with aspiring artisans to help them achieve brilliance in their careers.

Watch Tanja’s preview video below:

Bonuses worth $80 Still Available!

For The First 80 Registrants Only

Bonus 1

Gems & Jewellery Purchase eBook

This is complimentary 47-page coloured Gems & Jewellery Guide (worth $40) by Tanja Sadow herself, a perfect companion as you go through the two gem elearning courses and for your next trips to purchase gems and jewellery.

Bonus 2

Jewellery Supply Guide

One of the biggest challenges in starting a jewellery business is sourcing for quality materials. In this exclusive bonus lesson (worth $40), Tanja Sadow, the Dean and Founder of JDMIS, shares 4 important tips to acquire jewellery supplies and tools, as well as some common pitfalls to avoid during your purchase

More Reviews

From Past Participants

Sign Up Now

Gem Masterclass

- Life-time access to 2 On-Demand eLearning Modules ($200)
- Bonus: Gem & Jewellery Guide worth $40
- Bonus: Jewellery Supply Guide worth $40
- Dedicated Whatsapp/email support ($100)

Total value: 380 USD


This Masterclass consists of two online self-paced courses. You can enrol and start anytime, watching all the micro-learning videos and complete the final quiz. Do sign up before the countdown timer ends to qualify for the early-bird bonuses!

It has 2 hours of online learning (and another 30 minutes if you get the bonus lessons). It would take one to a few days of self-paced learning.

We care about our students’ satisfaction and this crash course is backed by a 30-day satisfaction guaranteed. Simply write to online@jdmis.edu.sg within 30 days of the purchase and also for any course-related inquiries.

You will receive timely support from the instructor, Tanja and the JDMIS Team via email at online@jdmis.edu.sg or WhatsApp us at +65 91254107.

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