Brilliant is a census-designated place and unincorporated community in eastern Wells Township, Jefferson County, Ohio, United States. It was named after the glass factory that once was located in the town. Previous names include Philipsburg and La Grange. Its zip code is 43913. It is located along State Route 7.An Ohio River town, it is located below Mingo Junction and above Rayland. The community is part of the Weirton–Steubenville, WV-OH Metropolitan Statistical Area.Brilliant was formerly incorporated as a village, but it disincorporated on November 24, 1993.