Illusion Setting

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.

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A .30 Carat Transitional Round Brilliant-Cut Diamond Sparkles in this Illusion Style Engagement Ring from the Mid-Century.
Image Courtesy of Lang Antiques.