COMINGS AND GOINGSMichael Lebowitz>> Michael Lebowitz has joined White Pine Trading as the head of its new White Pine ­Jewelry Solutions division. He was previously executive vice president at Buxbaum Jewelry Advisors.>> Harrods chief merchant Marigay McKee will become the new president of Saks Fifth Avenue following the completion of its purchase by Hudson’s Bay Co. She will replace Ron Frasch, who will resign after the merger, as will chairman and CEO Steve Sadove. Hudson Bay chairman Richard Baker will assume those two roles. Jennifer de Winter, the current EVP, director of stores for Saks, will take on the role of EVP, chief merchandising officer.>> Mastoloni Pearls has named Daniel Bogue its national sales manager.>> The Gemmological Association of Great Britain (Gem-A) appointed Brendan Laurs editor-in-chief of The Journal of Gemmology. He is a former ­e