Jade Buying Guide

Peridot Buying Guide

Sphalerite Buying Guide

Lapis Lazuli Buying Guide

Morganite Buying Guide

Emerald Buying Guide

Kunzite Buying Guide

Diamond Rating: A Beginner’s Guide

Tridacna Pearl Buying Guide

Sapphire Buying Guide

Spinel Buying Guide

Ammolite Buying Guide

Citrine Buying Guide

Malaya Garnet Buying Guide

Agate Buying Guide

Zircon Buying Guide

Turquoise Buying Guide

Opal Buying Guide

Chrysoprase Buying Guide

Quahog Pearl Buying Guide

Tanzanite Buying Guide

Pearl Buying Guide

Rutilated Quartz Buying Guide

Melo Pearl Buying Guide

Crystalline Quartz Buying Guide

Demantoid Garnet Buying Guide

Moonstone Buying Guide

Garnet Buying Guide

Precious Coral Buying Guide

Aquamarine Buying Guide

Alexandrite Buying Guide

Amethyst Buying Guide

Amber Buying Guide

Oregon Sunstone Buying Guide

Blue Tourmaline (Indicolite) Buying Guide

Rubellite Tourmaline Buying Guide

Chrome Tourmaline Buying Guide

Verdelite (Green Tourmaline) Buying Guide

Tourmaline Buying Guide

Watermelon Tourmaline Buying Guide

Topaz Buying Guide

Paraíba Tourmaline Buying Guide

Creating an Ethical Engagement Ring: the Complete Guide

Padparadscha Sapphire Buying Guide

Conch Pearl Buying Guide

Iolite Buying Guide

Ruby Buying Guide

Detailed gem buying guides with example pictures and gem prices. Covers color, clarity, cut, carats, origin, values, wholesale and retail prices, and more.

Gem Buying Guides

International Gem Society

The IGS Gem Price Guide covers commonly traded colored gems as well as more unusual, collectible gems. Prices are retail in US dollars. Unless otherwise noted, all prices are for cut gems and all weights are in carats. <a href="https://www.gemsociety.org/article/how-to-use-price-guide/" data-wpel-link="internal" target="_blank">Learn How to Use Our Gem Price Guide</a>

Gem Price Guide

Find out what your gem is worth with our Gem Buying Guides & Gem Price Guides. Everything you need to know to buy or sell gems.

Gem Buying Advice and Gem Pricing - International Gem Society

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Gem Buying Advice and Gem Pricing

Join 10,000+ members helping each other learn. For gemologists, gem collectors, hobbyists, jewelers, lapidaries and everyone in between.

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Hambergite Value, Price, and Jewelry Information

Pearl Simulants: How to Spot Faux Pearls

Amethyst Sources Around the World: The Geological Story Behind These Purple Gemstones

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Is This a Topazolite Garnet?

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Birthstone Chart

Blue Gemstones: 37 Varieties, Properties & Care Guide

Gemstone Hardness and Wearability

10 Rare Engagement Ring Stones that Won’t Break the Bank

How to Identify Ruby Simulants and Synthetics

The History of the Verneuil Method: Pioneering Lab-Grown Crystal Technology

Sapphire Treatment: The Complete Guide

Diamond Testing Tools: A Brief History and Review

In 2012, Donald Clark retired and passed along stewardship of the IGS to the Rosen family, who were longtime members of IGS. Lisa Rosen runs the day-to-day operation of IGS and  <a href="https://www.ganoksin.com/">The Ganoksin Project, a technical resource website for bench jewelers and jewelry manufacturers</a>.  Lisa strongly believes that IGS must remain a cost-effective, accurate, and comprehensive resource for all those interested in gemology. IGS is our passion, and it is a family business.

Lisa Rosen

Donald Clark, CSM founded the International Gem Society in 1998. Donald started in the gem and jewelry industry in 1976. He received his formal gemology training from the Gemological Institute of America (GIA) and the American Society of Gemcutters (ASG). The letters &#8220;CSM&#8221; after his name stood for Certified Supreme Master Gemcutter, a designation of Wykoff&#8217;s ASG which has often been referred to as the doctorate of gem cutting. The American Society of Gemcutters only had 54 people reach this level. Along with dozens of articles for leading trade magazines, Donald authored the book &#8220;Modern Faceting, the Easy Way.&#8221;

Donald Clark, CSM IMG

Jeffery Bergman, SSEF SGC, founder and director of <a href="http://www.primagem.com/">8th Dimension Gems</a> in Thailand, is an American gem dealer with more than 40 years of experience in gemstone and fine jewelry mining, cutting, wholesaling and retailing. His career has taken him to more than 50 countries and every continent except Antarctica. He has appeared on the BBC, CNN, NBC, ABC and GEO; and has been featured in Time, USA Today, National Geographic, Gems &amp; Gemology and Discovery Channel magazine. He is a regular guest speaker at gem lab seminars and gemological association conferences and universities.

Jeffery Bergman, SSEF SGC

Dr. Joel E. Arem has more than 60 years of experience in the world of gems and minerals. After obtaining his Ph.D. in Mineralogy from Harvard University, he has published numerous books that are still among the most widely used references and guidebooks on crystals, gems and minerals in the world.
Co-founder and President of numerous organizations, Dr. Arem has enjoyed a lifelong career in mineralogy and gemology. He has been a Smithsonian scientist and Curator, a consultant to many well-known companies and institutions, and a prolific author and speaker. Although his main activities have been as a gem cutter and dealer, his focus has always been education. <a href="https://www.joelarem.com/">joelarem.com</a>

Joel E. Arem, Ph.D., FGA

Fatma Oya Borahan, GG, FGG has Graduate Gemologist and Diamond Diplomas from the Gemological Institute of America (GIA) the German Gemmological Association (DGemG) and Gemmological Association of Great Britain (GemA). <a href="http://birdamlasu.com/">birdamlasu.com</a>

Fatma Oya Borahan, GG, FGG

Barbara Smigel is a GIA Graduate Gemologist, faceter, jewelry designer, gem dealer, gemology instructor and creator of the well-regarded educational websites <a href="http://www.acstones.com">acstones.com</a> and <a href="http://www.bwsmigel.info">bwsmigel.info</a>.

Barbara Smigel, PhD. GG

Dr. Gerald Wykoff is GG (Graduate Gemologist), a CSM (Certified Supreme Master gemcutter), educator, and author of several gemology books. He founded the American Society of Gemcutters in the 1980s and served for more than 10 years as the editor of its monthly magazine, American Gemcutter.

Dr. Gerald Wykoff GG CSM

A geologist, environmental engineer and Caltech graduate, Addison&#8217;s interest in the mesmerizing and beautiful results of earth&#8217;s geological processes began in her elementary school&#8217;s environmental club. When she isn&#8217;t writing about gems and minerals, Addison spends winters studying ancient climates in Iceland and summers hiking the Colorado Rockies.

Addison Rice

The late Jeff Graham was a prolific faceter, creator of many original faceting designs, and the author of several highly-regarded instructional faceting books such as <a href="https://rockpeddler.com/product-category/instructional-materials/">Gram Faceting Designs</a>.

Jeff R. Graham

Kyrylo Gubariev, Graduate Gemologist (GG, AJP) is a gemologist with a passion for sharing his knowledge with fellow gem lovers. Originally from Ukraine, he is currently based in Bangkok, Thailand.

Kyrylo Gubariev, Graduate Gemologist (GG, AJP)

Jim Buday was born and raised in Wisconsin. He attended college for biology, but realized that he preferred to work with his hands. He became a general contractor and home flipper. Jim then taught himself to cut gems by watching instructional YouTube videos and reading online forums. By 2019, he was confident enough in his skills to pursue selling his work. He founded the Reddit thread, Shinypreciousgems, which now sits at more than 25,000 members. Jim now works with gems and jewelry full time, and has also partnered with several jewelers to offer settings to his gemstone clients. Recently, Jim started creating his own gem designs. In his free time, Jim enjoys the outdoors, working on his land, and is building a house with his girlfriend, Raeanna.

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