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Gem and Jewellery Trade Secrets (GT100) — JDMIS jewellery course
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GT100Gemmology & Foundations30 hours

Gem and Jewellery Trade Secrets

Gem & Jewellery Trade Secrets is a gemmology & jewellery appreciation course that is part of every professional designer, maker & business persons' education!

Course information pack →from S$375 + toolkit

Master the Market. Source with Authority.

Transform your passion for gemstones into a professional advantage. Gain the insider expertise to evaluate and negotiate for gems with absolute confidence. Discover how much more there is to know about this exciting world.

This isn’t just a gemmology course. It is your entry pass into the inner circle of the jewellery trade.

Whether you are building a brand, advancing your career, or curating a personal legacy, the difference between an amateur and an expert is certainty. In an industry often clouded by opacity, misinformation, and cleverly disguised imitations and synthetics, knowledge is your most valuable asset.

Start your journey at the source of gemmology: learn about gemstone origins, see how gems are mined and how these extraordinarily valuable minerals get to market. Learn about gemmology quality and value factors for all types of gems, from Diamonds to Coloured Stones, Pearls, Phenomenal gems, and other Organics to Jade.

At JDMIS, we move beyond textbook theory. We train your eye and your business acumen simultaneously. You will not just "learn about gems" - you will learn to see them as seasoned dealers do. This comprehensive course gives you the knowledge and power to:

  • For the Professional & Entrepreneur: Eliminate costly purchasing errors. Verify quality instantly, negotiate prices based on hard facts, and build a reputation for unshakeable integrity.
  • For the Collector & Enthusiast: Stop guessing. Distinguish true rarity from marketing hype, discover undervalued treasures, and ensure every acquisition is a worthy investment.

Beyond the common trade practices, you will see imitations, synthetics and treatmented gems and understand the philosophy behind these whether used to harmlessly enhance or to deceive.

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Course outline


One schedule for every 30-hour certificate

Fee schedule

All ways to pay →
Learn at your own pace

Self-Paced Essentials

S$375 + toolkit
  • 15+ hours of video content
  • Lifetime access to all modules
  • Community forum access
  • Printable PDF guides
  • Project assessment & grading
  • 1-on-1 mentoring sessions
  • Industry-recognized certificate
Best Value for Worldwide Audience

Guided Certification

S$590 + toolkit
  • Everything in Self-Paced +
  • Project assessment & expert grading
  • 2× 15-min 1-on-1 mentoring
  • Weekly group office hours
  • Industry-recognized certificate
  • JDMIS alumni network
92% of Singaporeans select this

Classroom Immersive

Intl: Global Live Interactive

S$1,260 + toolkit
  • Everything in Guided Certification +
  • 15 hours live in-person training
  • 5 hours live synchronous online training
  • Singapore's most comprehensive jewellery training space
  • Time zones accommodated (multiple options)
  • Real-time feedback
  • Increased confidence

Professional Toolkit is a one-time add-on (ships worldwide; required for immersive training — price quoted at registration). Tiers build on each other; all are one-time payments with lifetime access.