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Mark Reyes, G.G.

Mark Reyes is the Lead Instructor for IGI North America, designing and teaching diamond, gem and jewelry grading workshops, seminars & webinars and coordinating online learning for IGI clients across all sectors.
Consumer Education For Consumers For Professionals GemBlog IGI Worldwide Lab Grown Diamonds

The Evolution and Impact of Lab-Grown Diamonds: A Comparative Study of the Last Five Years

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All About Colored Stones: Marcasite

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The 23.24-Carat Pear-Shaped Golconda Blue – A Diamond That Dazzles Through Time

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April’s Birthstone Gets Real: 15 Diamond Facts That You Might Not Know

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Colored Stones: Amber, Nature’s Time Capsule

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Consumer Education For Consumers For Professionals GemBlog

All About Colored Stones: Obsidian.

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Hematite: The Rock with a Magnetic Personality (Sort of!)

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Colored Stones: All about Bloodstone

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Sonoranite: The Desert’s Hidden Gem

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Ever Seen a Diamond Glow in the Dark?

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Designing Jewelry with Gemstones: A Sparkling Journey

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All About Colored Stones: Larimar, The Caribbean’s Ocean Gem

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The Motswedi: A Diamond Worth Talking About

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Jewelry & Fashion Unite: Pantone’s 2025 Color Trends

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Consumer Education For Consumers For Professionals GemBlog

All About Colored Stones: Zircon – Ancient Sparkle, Modern Charm.

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All About Colored Stones: Turquoise, A Gemstone with Personality

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Consumer Education For Consumers For Professionals GemBlog

All About Colored Stones: Blue Topaz, Winter’s Crisp Sparkle

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Consumer Education For Consumers For Professionals GemBlog

All About Colored Stones: November’s Dazzling Duo, Citrine and Topaz

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Consumer Education For Consumers For Professionals GemBlog

All About Colored Stones: Tanzanite, the Jewel of Kilimanjaro

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All About Colored Stones: Black Opal, the Gem of Lightning and Shadows

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Diamond Grading Essentials course
Consumer Education For Consumers For Professionals GemBlog IGI North America

5-morning Course @ IGI NYC: Diamond Grading Essentials

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IGI Grader
Behind the scenes Events For Consumers For Professionals GemBlog IGI North America

2-day Course @ IGI NYC: Intro to Jewelry Grading

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Consumer Education For Consumers For Professionals GemBlog Opinion

All About Colored Stones: Pink Tourmaline

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Consumer Education For Consumers For Professionals GemBlog Opinion

All About Colored Stones: Rhodochrosite

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