opals

Geology Science 7 of 7 appearances
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"opals" appearances by year

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All Geology clues by year

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# Clue Answer As Given Value Round Category Air Date Show
Australia produces some of the finest examples of these gems opals $1,200 DJ GEMS 2013-10-18 #6690
These October birthstones may lose their color & crack if allowed to dry out Opals $500 J GEMS & JEWELRY 1996-04-12 #2685
Australia's Lightning Ridge is known for its fine black ones opals $400 J GEMS 1991-10-15 #1637
The belief that these gems are unlucky may derive from a Sir Walter Scott novel, "Anne of Geierstein" opals $1,000 DJ GEMS & JEWELRY 1991-03-28 #1524
Many of the red stones are classified as the "fire" variety of this fiery gem come from Mexico opals $300 J GEMS 1990-11-08 #1424
The fiery colors of these milky stones are caused by impurities & by light catching the cracks opals $400 J GEMS & JEWELRY 1990-07-16 #1371
Black & fire are 2 varieties of this stone that is always cut in rounded form to display its colors opals $600 DJ GEMS 1988-11-22 #972
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