By A Mystery Man Writer
Some of the world’s most expensive diamonds are deemed priceless as there is no sale record of these most sought-after gems in history.
The Blue Moon is the world's most expensive blue diamond
Billionaire Buys World's Most Expensive Diamond for his Daughter
Top 20 Most Expensive Diamonds in the World - EDJ
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12 Most Famous Yellow Diamonds
Rare pink diamond sold for $71 million in Hong Kong
What Color Diamond Is The Most Expensive?
12 of the world's most expensive diamonds
World's Top 6 Most Expensive Diamonds
Top 10 Most Expensive Diamonds in the World