CLEAN : Rare flawless diamond fetches US$15.7m in Hong Kong auction

The video discusses the unique characteristics of a rare diamond, highlighting its exceptional quality, size, and rarity. It explains that the diamond was formed four to five times deeper in the Earth than average diamonds, making it potentially as old as the Earth itself. The video also emphasizes the diamond's top color, cutting, and clarity, making it one of the best ever offered at auction. Such diamonds are rare and unlikely to be seen again for decades.

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