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The Mystery of the Star Ruby (2002)
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Amazon.com Product Description (ISBN 080755510X, Paperback)The Alden children are visiting a gem mine that is holding its annual gem-hunting competition. It's not long before Jessie makes a fabulous find. But just when she's about to win the contest for finding the biggest ruby, her gem disappears!
(retrieved from Amazon Thu, 14 Feb 2013 13:56:10 -0500)
The Aldens take part in a hunt at a gem mine and discover that someone is out to sabotage the contest.
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