http://gia.edu/gemencyclopedia

The Oregon Ponderosa Mine by GIA. In this video, John Woodmark discusses the Oregon ponderosa sunstone mine. He reviews how sunstone gems goes from manufacturing to the market. Oregon sunstone, the official state gemstone since 1987, is natural copperbearing labradorite feldspar. Some examples exhibit red to green dichroism, and fine specimens larger than five carats can sell for more than $1,000 per carat. The road to the Ponderosa mine gains in elevation as the scenery gradually changes from meadows to thick stands of tall ponderosa pines. Plush Oregon sunstones are found in the plush Oregon area. They’re rapidly gaining attention as natural and untreated products of the United States, due to their unique optical and physical properties.

Learn more about sunstone with GIA's gem encyclopedia: http://www.gia.edu/sunstone
• Sunstone Quality Factors: http://www.gia.edu/sunstonequalityf...
• Sunstone Description: http://www.gia.edu/sunstonedescription
• Sunstone Buyer’s Guide: http://www.gia.edu/sunstone#buyersguide
• Sunstone History and Lore: http://www.gia.edu/sunstonehistorylore
• Sunstone Care and Cleaning Guide: http://www.gia.edu/sunstonecareclea...

The Official GIA YouTube Channel is a great resource for sunstone knowledge
• Finding Red Sunstone in the Ponderosa Pit:    • Finding Rough Sunstone in the Pondero...  
• The Beauty of Ponderosa Sunstone:    • Video  
• Frequency of Sunstone Mining:    • Video  
• Value of Rough Sunstone:    • Video  

GIA exists to connect people to the understanding of gems. Our videos provide more information on diamonds, gems, and other related topics
• How to Choose a Diamond | GIA Diamond Grading Guide:    • How to Choose a Diamond: 10Minute GI...  
• How to Read a GIA Grading Report:    • How to Read a GIA Grading Report Vide...  
• Sapphire and Ruby Mine in Palin, Cambodia:    • River Mining in Pailin, Cambodia, by GIA  
• Mining for Emerald in Brazil:    • Mining for Emeralds in Brazil by GIA  
• What Attracts Us to Ruby | History:    • What Attracts Us to Ruby: History by GIA  

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