Explore gemstones and precious materials used in jewellery:

  • Appreciating Coloured Gems

    Appreciating Coloured Gems

    Learn about the wide range of coloured gems, how they are classified and how to best appreciate their rare properties.
  • The 4 Cs of gems & diamonds

    The 4 Cs of gems & diamonds

    Learn the value factors like size, colour, cut and which you should focus on to get the best value gems for your budget!
  • Tips to spot imitations

    Tips to spot imitations

    Learn quick tips on how to look for telltale signs of non-genuine gems & pearls
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About the Author:

  • 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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