The world of gemstones offers such an endless choice of colour and variety of fascinating minerals that they can satisfy even the most difficult of people to please. Since the dawn of history, men have put their lives at risk in the search for the most beautiful, naturally created, specimens from earth.

What you will learn


Instructors' profile

  • Tanja, jewellery instructor portrait

    Tanja Sadow

    Tanja is an award winning jewellery designer & gemmologist with more than 4 decades of experience educating the jewellery industry across 4 continents. Dean and founder of JDMIS, Tanja works with aspiring artisans as well as top jewellery brand team members to help them achieve brilliance in their careers. Read More
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A message from Tanja


What our students have to say?

  • Thank you Ms Tanja for sharing every aspect and tip for beginners. It is very enriching and engaging. I enjoyed thoroughly.

    - Siti S.(Singapore)

  • The JDMIS environment truly felt comfortable to me when I joined and I found everyone to be very helpful. Tanja Sadow is a very professional instructor who shares knowledge and provides education in Gems and Jewellery arts. With JDMIS, I will continue my Jewellery Design course in the future. I would like to thank JDMIS for providing me with a professional education and making me feel more confident about my career choice.

    - Grace E. (Singapore)

  • JDMIS is the only school where you can learn professional techniques in jewellery making. Ms. Tanja Sadow is a great teacher and one can feel very comfortable with her and it's great fun in class.

    - N.B. (France))

  • I have recommended JDMIS to my friends so many times over the years, I can't remember how many times I've talked about it now. I always say it's not just fun but extremely practical in real life.

    - Stephanie T. (Singapore)

  • Excellent! I enjoyed this immensely. Time whizzed past without me realizing it!. I would most definitely tell my friends about JDMIS and I hope to come back and attend more courses in the near future.

    - C.R. (Brazil)

  • If you are thinking of joining the jewellery industry, attend JDMIS courses. Both courses that I have attended are useful for me, (especially) for my new jewellery business.

    - Jason T. (Singapore)

  • Fantastic instructors giving full support to students. Also showing high experience in the field. Professional and generous staff.

    - Cristiane O. (Singapore)

  • I would tell people about how professional the instructors at JDMIS are as well as the crafts and skills offered for upgrading

    - Dennis.W. (Singapore)

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