CLEAN : Preview ahead of Sotheby's jewellery auction in Geneva

The video discusses the significance and rarity of blue diamonds, highlighting famous examples like the Blue Moon of Josephine and their high value. It explains that these diamonds are primarily sourced from the Cullinan mine in South Africa, with only a small percentage being true blue diamonds. The video also shares a historical anecdote involving Catherine the Great, illustrating the historical importance and value of jewels.

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