![Illusion Set Diamond Engagement Ring, Mid-Century. Illusion Set Diamond Engagement Ring, Mid-Century.](https://www.langantiques.com/university/wp-content/uploads/elementor/thumbs/Illusion_Set_Engagement_Ring-q88jzchoqrs6rc0gjdqvo6stuwhng3j1l6bth0iaa0.jpeg)
An illusion setting is a prong setting designed to make a diamond look bigger than it actually is. This is accomplished by a ring of metal surrounding the girdle of the diamond that is often bright cut. This ring diffuses the outline of the stone causing it to look larger.