AGA Panel Scratches the Surface of Coated Diamonds

Colored diamonds are hot, but natural fancy-color diamonds are rare—and pricey. Hence, several types of enhanced color diamonds are appearing in the market. One enhancement that's arousing the color diamond market is being referred to as an “infusion technique.” The term infusion suggests that the resulting color has penetrated the stone's sur-face, but at a recent seminar in Las Vegas, John Koivula, chief gemologist at the Gemological Institute of America, and Chris Smith, vice president of American Gem Laboratories, explained that “infusion-treated” diamonds were actually coated diamonds. They also said the enhancement isn't permanent. “The number of such stones in the market is increasing, in virtually every color—including shades of yellow, pink, and blue that look just like natural stones—and in every shape and size, including melee,” reported Richard Drucker,
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