Why aren’t all pink diamonds equal?

No gemstone on earth commands attention quite like the pink diamond, but successful identification and continuing production is raising challenges across the entire industry. BRANKO DELJANIN, DR ADOLF PERETTI and MATTHIAS ALESSANDRI report.

Only one in 10,000 natural diamonds has enough colour to be graded a fancy-coloured stone. Blue and pink diamonds are considered the most expensive natural stones by weight in the world especially when they are saturated enough to be called fancy.

The...

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