Titanium: It’s not just for golf clubs anymore. And if you think ceramic is only for knick-knacks, think again. As visionary designers push the boundaries of fine jewelry, so-called nonprecious metals are becoming more valuable to everyday customers.Titanium, cobalt, ceramic: This might sound like a shopping list to build a space shuttle, but these materials have more down-to-earth, although equally inventive, purposes. All are being used with increasing frequency by fine jewelry designers seeking new ways to excite customers. Today’s shoppers want pieces that speak to their individuality, have the durability to be heirlooms, and don’t break the bank.A handful of fine jewelry marquee names like Germany’s Christian Hemmerle and New York City’s James de Givenchy pioneered the use of these materials years ago to make their bold couture designs stand out from the pack; now, their s