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Colored stones are offered in an array of different colors and styles. There are variations of color, variety, pattern and hue which may be used in our jewelry. Nearly all colored stones sold at jewelers or specialty retailers, including those sold at the Metropolitan Museum of Art Store, are enhanced or treated using various techniques. Many of these techniques have been used for centuries. The Metropolitan Museum of Art Store’s jewelry reproductions and adaptations utilize colored stones sourced through approved manufacturers with any or all of the following treatments and enhancements in accordance with acceptable industry standards.