Blessed is the corundum that contains rutile. Not only does this mineral produce asterism—the star-effect—in sapphires, it also acts as a bluing agent when combined with iron. There’s only one drawback.


Union Carbide Blue Stone Bluing Agent Rutile Needle Natural Star 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Modern Jeweler Magazine 1990

Authors and Affiliations

  • David Federman

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