A bevy of new virtual B2B platforms enable brands, manufacturers, and retailers to connect, see new lines, and access everything you want to know about designer collections 24/7One Saturday afternoon last fall at David’s Ltd. Jewelers in Charlotte, N.C., operations, sales, and inventory manager Whitney Ledbetter was showing Precision Set wedding bands to a couple. The pair asked to see the only style—a 0.5 ct. t.w. channel-set band—the store didn’t have in stock. For most jewelers, this is a dreaded scenario, but Ledbetter had a secret weapon: a subscription to OPT Central (optcentral.com)—the wholesale inventory management, e-commerce, and sales and marketing tool that allows retailers and designers to connect, keep current with product, and check pricing even when brands aren’t open for business.Logging in to the platform, she queued up the SKU the customers wanted and pric