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What Will You Learn

  • Building a knowledge base about coloured stones and the coloured stone market
  • Using gemmological equipment effectively to identify gemstones
  • Explaining the GIA Colored Stone Grading System and evaluating gemstone quality
  • Recognising how quality, rarity and colour affect value
  • Determining how market factors affect gem value

Possible Career Paths


Coloured Stone Manufacturer

jewellery Manufacturer

Loose Coloured Stone Buyer and Seller

Jewellery Retailer and Wholesaler

Lab and Research Professional

Topics Covered

Coloured Stones & Coloured Stone Grading

Learn the characteristics of coloured stones, with a focus on ruby, sapphire, and emerald.

Gem Identification

Identify more than 60 species of gemstones, distinguish naturally from laboratory-grown gems, and detect gem treatments.

Equipment & Instrumentation

Learn diamond identification and grading skills GIA graders use.

Treatments, Laboratory-Grown & Imitations

Identify gemstones that have been laboratory-grown, treated or are imitations.

Markets & Supply Chains

Understand how market factors and the supply chain affect value.

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About GIA

Established in 1931, GIA protects the public through gemmological research, education, impartial gem identification and grading services, and instrument development. The world’s foremost authority in gemmology and creator of the 4Cs, GIA sets the standard for determining the quality of diamonds and performs research-based identification of coloured gems and pearls. All of GIA's activities are governed by its mission to serve the public. Learn More