How to Spot a Good Oval Diamond: Understanding the Bow Tie Effect

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When shopping for an oval diamond, the bow tie effect is a critical factor—it's the dark, cross-shaped shadow that can appear across the stone if cut poorly. A good oval should have a subtle, balanced pattern that doesn't distract from its brilliance. Look at the diamond in natural light from different angles; if the bow tie is too dark or large, it can dull the sparkle. The best oval diamonds have a soft, evenly distributed light return, making the shape look lively rather than patchy.