The following 25 questions are from the Spring, Summer, and Winter 2018 issues of G&G. (The Fall 2018 issue, which contained the proceedings of GIA’s International Gemological Symposium, is not included.) Please refer to the articles in those issues to find the single best answer for each question.

The Challenge must be completed no later than Friday, August 12, 2019. All entries will be acknowledged with an e-mail, so please remember to include your name and e-mail address.

Score 75% or better, and you will receive a certificate of completion (PDF file). Earn a perfect score, and your name also will be listed in the Fall 2019 issue of Gems & Gemology.

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