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10 of the most expensive celebrity red carpet jewels ever, ranked – from Madonna's Harry Winston diamonds and Lady Gaga's US$30 million Tiffany & Co necklace, to Beyoncé's Lorraine Schwartz jewellery
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Mukesh and Nita Ambani gift world's most expensive diamond necklace worth Rs 492 crore to Akash Ambani's wife Shloka Mehta
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