Vietnam's jewelry industry faces a crisis after police uncovered a massive smuggling ring importing over 30,000 counterfeit diamonds (1.9 billion baht value) with altered GIA certifications. Major retailers including Phu Nhuan Jewelry and Saigon Jewelry are implicated; market confidence has collapsed with PNJ losing ~50% market value, shops reporting 100+ daily return requests, and regulatory crackdowns underway. The scandal threatens a sector where diamonds hold cultural significance as wealth storage for Vietnamese households.