| 摘要 |
PROBLEM TO BE SOLVED: To provide an improved quadrilateral brilliant cut for diamond having a facet structure with an optimum shape to increase the amount of visual reflection light. SOLUTION: In this quadrilateral brilliant cut for diamond, each of the bazel facets on the 4 crown apices is bent on diagonals parallel to a girdle and has a facet structure divided into an upper bazel facet and a lower bazel facet. Because the upper crown angle of the upper bazel facet can be smaller than that of the lower bazel facet, the angles of the star facet having a strong reflection and a second bazel facet to the horizontal line can be reduces the area can be enlarged by slightly reducing the table facet for even if the crown height is the same. With this cut, the reflection pattern becomes a visually-preferred equally-sized pattern. This effect and the effect of enlarging the areas of the star facet and the second bazel facet make the reflection extremely large. COPYRIGHT: (C)2004,JPO |
