These are the ideal crown angles of 34.5 ° with a 53% table which makes for a nice crown height.

These crown angles are very high at 41 ° and the table size is 53%. This diamond would be negatively affected by the extreme crown height.

The crown angles are 51 °, cutting off the intended escape route for dispersed light. This diamond should be discounted considerably for this very negative characteristic. Although being an ideal 53%, the table won't help this poor make very much.

These 26 ° crown angles will reduce the dispersion significantly by not allowing a large necessary contrast between the table and the angles surrounding it. Ideal crown angles were designed to provide a route for exiting dispersion, as well as additional contrasting directions for entering light.

These 14 ° crown angles present very little contrast with the table, so that the possible directions for entering light is severely limited. The visible dispersion is also reduced by the limited viewable directions.