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What are the jewels in a watch for?
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Why Do Watches Have Jewels: Sapphires, Rubies or Emeralds Best?
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Why Are Rubies Red? | Wonderopolis
What are the jewels in a watch for?
Why are Rubies Red? What Colors Them? | Gem Rock Auctions
What Are Rubies Used for Today? | LEAFtv
Why are Rubies Red? What Colors Them? | Gem Rock Auctions