In the preface to Secrets of the Gem Trade, author Richard W. Wise states his intention to provide collectors with information about the gem trade, "a trade that has kept its secrets for thousands of years." And, further, to guide the collector toward becoming an expert in gem appreciation. It is a promise that Wise keeps.
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机译：作家理查德·怀斯（Richard W. Wise）在《宝石贸易的秘密》（Secrets of the Gem Trade）的序言中指出，他打算为藏家提供有关宝石贸易的信息，“这种贸易已将其秘密保存了数千年。”并且，进一步指导收藏家成为宝石鉴赏专家。这是Wise信守的诺言。
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