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Tag Archives: American Gem Society

Antique Yogo Sapphire Pin

Tuesday, April 8, 2014

A client inherited this gorgeous antique Yogo Sapphire pin and asked us to appraise it. Sapphires were known to occur in several areas of western Montana as early as 1865. For the most part, these deposits produced only moderately good sapphires. The discovery of sapphires in Yogo Creek was different. In 1895, famed gemologist G.F. Kunz, […]

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Topaz or Not Topaz? That is the Question!

Thursday, November 22, 2012

One of the missions Robert M. Shipley defined when he created the Gemological Institute of America was to rectify incorrect practices in the jewelry and gem business. One of the most common of these is the use of trade names and misnomers for gemstones. Before the development of the gemological sciences, it was common for gem […]

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What is a Built-up Diamond?

Thursday, January 27, 2011

These days, we buy a lot of jewelry, used as well as new. Last week, I worked with a young lady, a bit down on her luck and on the rebound from a relationship that didn’t work out. She was looking to sell her white gold solitaire ring that was set with the one carat […]

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