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Photo Gallery: Gems
1 of 10NEXT
Photo: Unpolished ruby
Photo: Unpolished rubyPhoto: Yellow diamond in kimberlitePhoto: Rubies set against black rocksPhoto: Emerald ShinePhoto: A gem minerPhoto: A topaz gemstonePhoto: A star sapphirePhoto: Tourmaline gemstonePhoto: A diamond ringPhoto: Crown of Britain's Queen Mother
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Unpolished ruby, Tanzania
Photograph by bildagentur-online.com/th-foto/Alamy

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