Be Informed / Colored Gemstones

Colored Gemstone Facts

Colored Gemstones

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The 4 C’s

Learn more about the 4 C’s with IGI’s E-learning tools

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IGI's supreme position in the gemological world is no coincidence. It is the result of continuous research, support and synergy with professionals and consumers alike. IGI is the largest organization of its kind, operating 20 laboratory locations around the world grading finished jewelry, natural diamonds, lab-grown diamonds and gemstones - and 14 schools of gemology graduating thousands of new jewelry professionals each year.

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