HOT STOCK TIP Baguette Lady When Timeless Designs’ Jackie Cohen adopted a baby, she also brought a new jewelry line, My Story, to life. Most pieces in the mom-friendly collection, centered on stacking bands and layering necklaces, feature a baguette-cut center in the birthstone of choice. Styles are rendered in 14k gold; retail prices for bands start at $850; bar necklaces start at $865.     CAN’T-MISS COLLECTION The Perfect Fix Seattle-based jewelry designer Jamie Joseph has been saving broken stones—casualties of her in-house cutting operation—for 20 years. Recently, she came up with a novel idea for what to do with them. Joseph’s Golden Joinery ­collection, which debuted at ­Couture in June, is inspired by kintsugi, the Japanese art of repairing broken pottery. Pieces feature cleaved gems whose fissures are filled with 22k gold seams. Al