The Make : Symmetry We consider symmetry very important in the making of a beautiful diamond. Without symmetry, the facets of the upper part of the diamond (called the crown) and the lower part (called the pavilion) may not match up. Poor facet alignment will allow light to leak out before it reflects back to your eye -- resulting in less brilliance and fire. In other diamonds, such as a heart shape, poor symmetry may cause one side to be broader than the other and give it a lop-sided appearance, or result in uneven facet arrangements that allow light to leak. Grades for symmetry range from Ideal (which is very rare) to Excellent, Very Good, Good, Poor, and Fair. We consider Good symmetry to be the minimum for engagement ring. Please Note: Discounts for stones outside of these limits are too difficult to explain here. If you want to learn how to calculate a price for any diamond you want, please see my easy, fast, step-by-step Diamond Pricing Tutorial page. Back to: How to Read a Certificate