| 摘要 |
A cut design for diamonds having a crown of substantially a frustum shape and substantially a conic pavilion directly under the frustum part, the diamond being enhanced in the brilliancy and scintillation of its crown part, the brilliancy and scintillation twinkling, and bluish lights being returned as reflected lights. A crown angle c and a pavilion angle p are so determined that lights coming in crown facets and emitted from crown facets, lights coming in the table facet and emitted from the crown facets, and lights coming in the crown facets and emitted from the table facet be directed toward the observer at the same time. Further, it is preferable to determine the crown angle c and the pavilion angle p so that the angles formed by incident lights and emitted lights are substantially equal to each other. Its table diameter should be between or equal to 0.60 and 0.33, more preferably not more than 0.55 and even more preferably not more than 0.38, in its ratio to the girdle diameter.
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