CIBJO Blue Book Defines Paraíba.

Jewelers Circular Keystone,  May, 2007  

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By Gary Roskin, G.G., FGA

In the 2006/07 edition of the CIBJO Blue Books (Annex B - Commercial Names), the name Paraíba stands for any green-to-blue tourmaline colored by copper, regardless of country of origin. The standards found in the Blue Books are established by experts on the subject within CIBJO committees, and from individuals outside the committees who express interest in developing the guidelines.

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Roland Naftule, Nafco Gems Ltd., Scottsdale, Ariz., president of CIBJO's Sector 3 (Gem Materials, Trade and Laboratories), confirms that Paraíba has ...

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