Sunny-Side UpFancy colored sapphires are popular across the board, but if you had to cast a vote for the season’s most popular hue, it would be lemony yellow, with purple and green not far behind—though even white sapphires are enjoying steady demand as a substitute for diamonds.“Consumers want colorful standout jewelry that could transform ordinary attire into something extraordinary,” says Michael Hezar, CEO of Los Angeles–based Michael John Jewelry.Daniel Gibbings of Daniel Gibbings ­Jewelry in Montecito, Calif., agrees that sapphires are a perennial client favorite. “For centuries, sapphire was known as the gem of the soul, symbolizing trust and honesty and that brings a story and romance to each design,” Gibbings says.Meanwhile, Nayana Hettiarachchi, manager at ­Renelle Pvt. Ltd. in Colombo, Sri Lanka, which specializes in designs for the U.S. market, says demand for