Pop icon Taylor Swift and Kansas City Chiefs tight end Travis Kelce revealed their engagement on Aug. 26 in a five-photo Instagram post that quickly became the platform’s most-liked by a musician, drawing more than 34 million likes. Gemologists consulted by Reuters valued Swift’s old-mine diamond ring at roughly $650,000 to $700,000. Financial markets responded almost immediately. Shares of Signet Jewelers, one of the few publicly traded jewellery retailers, climbed more than 3 percent the day the news broke. By 10:20 a.m. New York time the following morning, trading volumes in Signet were running at about eight times the stock’s 30-day average as fans dissected the cushion-cut design shown in the engagement photos. Brands also rushed to capitalise. American Eagle Outfitters named Kelce the face of a limited-edition “AE × Tru Kolors by Travis Kelce” collection on Aug. 27—less than 24 hours after the couple’s announcement—marking the retailer’s second high-profile celebrity partnership this year. Speculators are placing bets on what comes next. Prediction-market operator Kalshi said users wagered roughly $80,000 within hours on when the wedding will occur, while rival platform Polymarket opened contracts ranging from a potential Super Bowl halftime appearance to the couple’s first child. Swift displayed her new ring during the pair’s first public outing since the announcement, joining Kelce, his brother Jason and teammate Patrick Mahomes at Cincinnati’s season-opening college football game against Nebraska at Kansas City’s Arrowhead Stadium on Aug. 28.