The 228.31-carat stone, larger than a golf ball, was sold in Geneva by Christie’s auction house.But the bidding, which started at 14 million Swiss francs, ground to a halt after two minutes at 18.6 million, with the price rising to 21.7 million once the buyer’s premium was added on.The Rock, a perfectly symmetrical pear-shaped diamond, was sold by an unnamed owner from North America. It was bought by a private collector bidding by telephone.Diamonds are graded in colour from D to Z and Kadakia told AFP that despite falling short of the overall record, The Rock had set a new world record price per carat for a G-colour diamond.Max Fawcett, head of the jewels department at Christie’s auction house in Geneva, said there were only a handful of diamonds of similar size and quality to The Rock.- Red Cross gem -A seven-figure chunk of the proceeds will be donated to the International Committee of the Red Cross, headquartered in Geneva, at a time when war is once again stalking the European continent.Multiple bidders fought fiercely over the gem for 10 minutes, ending in a duel in increments of 50,000 francs before one private collector won through.As well as ranking among the largest diamonds in the world, a striking feature is its pavilion, which naturally bears the shape of a Maltese cross.The Red Cross Diamond fetched £10,000 — approximately £600,000 ($740,000) in today’s money. It was bought by the London jewellers S.J. Phillips.”A 104-year history of the diamond with Christie’s; we’re very pleased that we were able to locate it, and we’re very pleased that we were able to secure it in another private collection,” said Kadakia.It was estimated at 400,000 to 600,000 Swiss francs. However, it sold for way more: 2.4 million francs, having caught the eye in a prominent spot at the pre-sale exhibition….