World’s Most Expensive Diamond Engagement Rings Facebook Prev Article Next Article 5. Melania Knaussās Engagement Ring: The ring remains a production of Graff and it is encrusted with a 15 carat emerald-cut diamond. Donald Trump willingly presented the ring to his wife Melania Knauss. It cost $3 million. Previous 1 2 3 4 5 6 7 8 9 10Next Prev Article Next Article Related Posts Jennifer Aniston Plastic Surgery Best Exercises for Women Most Expensive Wedding Dresses World’s most expensive diamonds Prepare Yourself For Dental Implants Massive $159M Florida Estate