Tom Wheeler, the owner of Opal Fields, a jewelry store that has spent past five years in Ala Moana Center, has moved the location back to its roots at Waterfront Plaza in Honolulu. "We are back for the renaissance of Restaurant Row," he said this week. The store has been in operation since 1984. It was founded in Madison, Wisc., as the manufacturing and export outlet for Opal Fields in Sydney, Australia. In 1989, Wheeler and his partners opened its first Hawaii space at Waterfront Plaza, which…