Sotheby’s set a record for a matching group of ruby jewelry with its sale of 19th-century ruby and diamond earrings and a necklace once owned by Mary, the Duchess of Roxburghe. The two lots were sold in Geneva yesterday for a combined price of 5.8 million Swiss francs ($5.77 million), five times the high estimate, to two Asian buyers. A record €2.05 million ($3.08 million) was paid for a rare, large 2.52 carat green diamond. Intense blue diamonds also reached new price heights. The jewelry auction raised a total 37 million francs,...