ZURICH (Reuters) – Cartier jewellery owner Richemont reported a 4% in sales during its third quarter on Thursday, as the world’s second-largest luxury group became the latest company in the sector to post a slowdown in demand. Sales rose to 5.59 billion euros ($6.09 billion) in the three months to the end of December, said the company that also owns Swiss watchmakers Jaeger-LeCoultre, IWC and Piaget. The Q3 figure exceeded the 5.48 billion euros forecast by Barclays and 5.44 billion euros forecast by the RBC, but fell short of the 5.7 billion euros forecast by Zuercher Kantonalbank. ($1 = 0.91…