CAN’T-MISS COLLECTION Ice Dream Unlike many East Coasters, Madstone designer Kerri Halpern has a positive takeaway from ­winter: her Melting Ice collection. Inspired by—what else?—dripping icicles, the whimsical styles feature myriad tiny stones like Paraiba tourmaline and diamonds. Retail prices start at $1,900. Melting Ice open ring in 18k gold with 0.52 ct. t.w. diamonds; $3,200; Madstone, NYC; 212-518-6607; madstonedesign.com HOT STOCK TIP Fresh Flair Xiao Wang’s diamond jewels—especially those featuring natural colored gems—are modern, distinctive, a