In a city where commerce and culture have long negotiated their boundaries, Van Cleef & Arpels has crossed the street — and, in doing so, crossed into something larger. The French jeweler's move from Landmark Prince's to a purpose-built flagship at Alexandra House is less a relocation than a declaration: that luxury, at its most considered, aspires to be a place of memory, craft, and gathering. Forty-five years after Jacques Arpels first brought the house to Hong Kong, the new 564-square-meter space asks whether a boutique can also be a cultural institution.