On her: Metallic effect dress, $990, by Rosetta Getty at Forty Five Ten; opal drop earrings, $3,175, by Zadok, and statement ring with opals and diamonds, $11,500, by Sutra, both at Zadok Jewelers; opal ring, $7,780, by Arman Sarkisyan, leaf ring, $5,000, by Penny Preville, and Ten Table ring, $16,625, by Sylva & Cie, all at Lesley Ann Jewels; sandals, $750, by Miu Miu at Forty Five Ten. On him: Sateen dinner jacket, $1,695, by Etro, wool trouser, $495, by Ermenegildo Zegna, and shoes, $680, by Ferragamo, all at M Penner; shirt, $185, by Vince at Neiman Marcus.