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In this blog post, find out what makes certain pearls more expensive than others, why a diamond's colour could adjust its value and what makes rubies so attractive.

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GENEVA -- A 17.07-carat pink diamond sold for a hammer price of 18.3 million Swiss francs ($18.3 million) at a Geneva jewelry auction Wednesday, cruising past both its pre-sale estimate and the winning bid for the "Sky Blue" diamond billed as the event's standout piece. The step-cut pink diamond, set in a ring between triangular white diamonds, had been expected to draw a maximum of 14.76 million francs. Instead, it sold at Sotheby's for more than the 8.01-carat "Sky Blue" diamond, which carried a pre-sale estimate of up to 25 million francs and went for 15 million. The auction house...

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