Subscribe | UPI Odd Newsletter Subscribe PITTSBURGH, May 22 (UPI) -- A Pittsburgh man who won a 1.6-carat diamond ring worth $15,000 in a scavenger hunt accepted the prize and promptly proposed marriage to his girlfriend. Mark Seneca, 30, said he entered the Henne Jewelers Diamond Dash, a 2-hour scavenger hunt in Pittsburgh, because he couldn't afford the wedding ring he wanted to buy his girlfriend, Nicole McQuay, 29, the Pittsburgh Tribune-Review reported Sunday. Advertisement The couple have been dating for seven years, and Seneca said he intended to propose as part of a 30th birthday surprise for McQuay but thought the contest would be a more adventurous opportunity. To win, contestants had to answer trivia and math questions about local Pittsburgh Golden Triangle landmarks via text messages. When Seneca and McQuay went on stage at a Station Square restaurant to accept the ring, Seneca dropped to one knee and proposed in front of a crowd of cheering scavenger hunt competitors as the occasion turned into an impromptu engagement party. "We've been talking about getting engaged, but I told him, 'You don't have to do it today,'" McQuay said. "But I guess we are now, so there's really no turning back!" Advertisement Read More YouTube proposal video goes viral Judge says no doubt sex abuser is gay 354 couples wed at once in Bolivia