Andrew W John's Articles in Jewelry

  • Yellow Sapphires: The Jewelers Secret
    Yellow sapphires belong to a group of colorful gemstones known as corundums, which is a crystallized form of aluminum oxide. Like other colors of fancy sapphires, the yellow is rather rare, and until recently, most of these more unusual colors were not well known among most people. Yellow occurs when a trace of iron is added to the aluminum oxide.

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