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Mark Reyes, G.G.

For several decades Mark Reyes served as gemologist and 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.
All posts Consumer Education GemBlog IGI Worldwide

Move over emerald—there’s a new green gem stealing the spotlight. Tsavorite

by Mark Reyes, G.G. | Leave a Comment
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

by Mark Reyes, G.G. | Leave a Comment
Consumer Education For Consumers For Professionals GemBlog IGI Classroom IGI Worldwide News Opinion

All About Colored Stones: Marcasite

by Mark Reyes, G.G. | Leave a Comment
All posts Consumer Education For Consumers For Professionals GemBlog IGI Worldwide

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

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All posts Consumer Education For Consumers For Professionals GemBlog IGI Worldwide Lab Grown Diamonds

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

by Mark Reyes, G.G. | Leave a Comment
For Consumers GemBlog IGI Classroom IGI North America IGI Worldwide Lab Grown Diamonds

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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All posts Consumer Education For Consumers For Professionals GemBlog IGI India IGI North America IGI Worldwide News

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

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All posts Consumer Education For Consumers For Professionals GemBlog IGI North America IGI Worldwide News

Colored Stones: All about Bloodstone

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All posts Consumer Education For Consumers For Professionals GemBlog IGI Classroom IGI North America IGI Worldwide

Sonoranite: The Desert’s Hidden Gem

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All posts Consumer Education For Consumers For Professionals GemBlog IGI Classroom IGI North America IGI Worldwide News

Ever Seen a Diamond Glow in the Dark?

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Consumer Education For Consumers For Professionals GemBlog IGI Classroom IGI North America IGI Worldwide News

Designing Jewelry with Gemstones: A Sparkling Journey

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Consumer Education For Consumers For Professionals GemBlog IGI North America IGI Worldwide News

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

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Consumer Education For Consumers For Professionals GemBlog News

The Motswedi: A Diamond Worth Talking About

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All posts GemBlog

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 posts For Consumers GemBlog IGI Worldwide Pillar

All About Colored Stones: Turquoise, A Gemstone with Personality

by Mark Reyes, G.G. | Leave a Comment
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 posts Consumer Education For Consumers For Professionals GemBlog

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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