The following 25 questions are from the Fall, Spring, Summer, and Winter 2019 issues of G&G. 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, October 9, 2020. 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 2020 issue of Gems & Gemology.

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