Now Showing: Why is 'Girl with a Pearl Earring' a masterpiece?; up close with coral; and making a Star Wars-inspired ring

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Now Showing: Witness the creation of a $300,000 sapphire ring; explore India's lab-created diamond industry; and learn more about jewellery repairs.

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Now Showing: A journey to world's most exquisite high jewellery treasures; The Australian opal secret you need to know; and how diamonds grow

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Now Showing: Can you spot the difference; Sapphires on sneakers; and heart turned into solid gold

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Now Showing: Lazy jeweller ruins $200k engagement ring; impossible watch defies physics; and world's largest crystal cave

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Now Showing: Meet the jeweller who invented diamond 'grillz'; why is Cartier so expensive?; extravagant peacock necklace gouache illustration

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Now Showing: Turning old jewellery into 24 carat pure gold bars at home; see diamonds uncut natural roughs of all sizes

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Now Showing: 5 gemstones more expensive than diamonds; Why beautiful things make us happy

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Now Showing: Making a lapis lazuli glowing ring; $US70m pink diamond; get to know Australian sapphires

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Now Showing: Master jeweller carves humans into gemstones; make synthetic ruby at home; and revisiting Elizabeth Taylor's jewellery

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Now Showing: An iconic Van Cleef & Arpels necklace; explore the Tiffany & Co. VIP suite; and the most beautiful crown jewels