I am a man. And I love looking at diamonds. With so many shapes, from round to fancy, the diamond shapes that never fail to catch my attention are princess, emerald, and radiant. The most widely sold and circulated diamond shapes for jewelry are: 1. Round 2. Princess 3. Emerald 4. Asscher 5. Marquise 6. Oval 7. Radiant 8. Pear 9. Heart 10. Cushion A diamond shape that is gaining momentum, that did not make the list, is the Trilliant triangle shape.