AGTA Lab Has New Padparadscha ID

Ken Scarratt, director of the American Gem Trade Association's Gemological Testing Center (AGTA-GTC) says the lab now can determine clearer parameters for the color description of padparadscha sapphires. "We didn't just home in on our own science or opinion," notes Scarratt. "We talked to people in all corners of the world—the Japanese market, the Thai market, the U.S. market, of course—and 99.99% of those we spoke with were very clear that padparadscha required a mixture of orange and pink." The research project examined every potential padparadscha submitted to the lab, "We measured the color of each stone using the GemSpec spectrophotometer," says Scarratt. "We then formed a 3-D model of theoretical and actual data to see where the various colors fell in the corundum gamut, and then looked to see if they were separable by visual means." The researchers discovered a distinct gr
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