Graduate Gemologist® Online Diploma

The GIA Graduate Gemologist® online diploma coursework delivers a comprehensive gemology education on diamonds and colored stones. Using the latest gemological equipment, students work with real diamonds and gemstones under the trained eyes of GIA instructors. Through extensive lab work, students practice identifying and grading diamonds and colored stones in an efficient, accurate and consistent manner. 

What You'll Learn

  • Develop in-depth, hands-on experience with the GIA International Diamond Grading System™ and the 4Cs (color, clarity, cut and carat weight)
  • Grade diamonds in the D-to-Z color range
  • Build a knowledge base about colored stones and the colored stone market
  • Use gemological equipment effectively to identify gemstones
  • Use the GIA Colored Stone Grading System to evaluate gemstone quality
  • Identify gemstone characteristics, simulants and treatments, laboratory-grown gemstones and recognize when advanced testing is required
  • Understand how gems are mined, fashioned and brought to the marketplace
  • Recognize how quality, rarity and color affect value
  • Determine how market factors affect gem value

Possible Career Paths

  • Appraiser
  • Auction House Jewelry Specialist
  • Colored Stone Buyer
  • Diamond Buyer
  • Diamond Sorter/Grader
  • Estate Jewelry Dealer
  • Gemologist
  • Inventory Control Specialist
  • Jewelry Business Owner
  • Jewelry Buyer
  • Jewelry Sales Professional
  • Lab and Research Professional
  • Merchandiser
  • Pawnbroker
  • Retailer
  • Sales Associate
  • Wholesaler
View Popular Career Paths

Topics Covered

Here are some of the topics covered in the Graduate Gemologist® online diploma coursework

PE_GGP_TopicsCovered-Diamond-132x74 DIAMONDS & DIAMOND GRADING

Judge and grade diamonds by the 4Cs and color.


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


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

PE_GGP_TopicsCovered-Equipment-132x74 EQUIPMENT & INSTRUMENTATION

Learn diamond identification and grading skills GIA graders use.


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

PE_GGP_TopicsCovered-Markets-132x74 MARKETS & SUPPLY CHAINS

Understand how market factors and the supply chain affect value.


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How to Earn the Graduate Gemologist® Online Diploma

Enroll and complete five online courses and three lab classes.

We recommend this sequence to maximize your comprehension of key concepts and course objectives:

GEM 130 – Diamond Essentials Online Course

GEM 230 – Diamonds & Diamond Grading Online Course

GEM 230L – Diamond Grading Lab Class

GEM 120 – Colored Stone Essentials Online Course

GEM 220 – Colored Stones Online Course

GEM 220L – Colored Stone Grading Lab Class

GEM 240L – Gem Identification Lab

GEM 240 – Gem Identification Online Course

Select a course or lab class above to learn more and apply

View the Online Diploma Requirements Chart

Learn about Online Education