1. ExhibitionsThrough March 9, visitors to the Metropolitan Museum of Art’s “Jewels by JAR” exhibition will see the oeuvre of a master ­jeweler to rival the great Peter Carl Fabergé: the Bronx-born, Harvard-educated, Paris-bred Joel A. Rosenthal, aka JAR. The Met is showing some 400 of his works, all of which make clear his remarkable way with gem-setting and visionary use of color. “JAR is in a class by himself,” says François Curiel, Christie’s international head of jewelry. “I’ve stopped giving estimates for his jewels. The pieces are so rare. There are probably 200 to 300 people waiting for one.” Not counting, that is, museumgoers, who can own a JAR original through a special collection he created for the Met. The eight styles of earrings ($2,000–$7,500) and two watches ($600) are sold only at the museum—not online—but given JAR’s reputation, there’s no