Van Cleef & Arpels unveiled its new high-jewelry collection to the international press and VIP clients in Paris in July, presenting a mouthwatering selection of large, colorful gemstones and diamonds in imaginative and sometimes flamboyant designs. The spectrum of colored gemstones harks back to the brand’s roots; it was established over a century ago when Estelle Arpels, the daughter of a precious-stone merchant, and Alfred Van Cleef, the son of a lapidary, married. The French jewelry house was born with …