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Nathan Renfro, senior manager of colored stones at the GIA, discusses treatments, synthetics, gemstone origin, and what attracts consumers to rubies, sapphires and emeralds. Plus: How the cookie monster appeared in an agate.
By Rapaport3.2
1818 ratings
Nathan Renfro, senior manager of colored stones at the GIA, discusses treatments, synthetics, gemstone origin, and what attracts consumers to rubies, sapphires and emeralds. Plus: How the cookie monster appeared in an agate.

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